Artykuły w czasopismach: „Spin-orbit Coupling (SOC)”

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Jabbarzadeh Sani, Mahnaz. "Spin-Orbit Coupling Effect on the Electrophilicity Index, Chemical Potential, Hardness and Softness of Neutral Gold Clusters: A Relativistic Ab-initio Study". HighTech and Innovation Journal 2, nr 1 (1.03.2021): 38–50. http://dx.doi.org/10.28991/hij-2021-02-01-05.

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Electrophilicity index (𝜔) is related to the energy lowering associated with a maximum amount of electron flow between a donor and an acceptor and possesses adequate information regarding structure, stability, reactivity and interactions. Chemical potential (μ) measures charge transfer from a system to another having a lower value of μ, while chemical hardness (η) is a measure of characterizing relative stability of clusters. The main purpose of the present research work is to examine the Spin-Orbit Coupling (SOC) effect on the behavior of the electrophilicity index, chemical potential, hardness and softness of neutral gold clusters Aun (n=2-6). Using the second-order Douglas-Kroll-Hess Hamiltonian, geometries are optimized at the DKH2-B3P86/DZP-DKH level of theory. Spin-orbit coupling energies are computed using the fourth-order Douglas-Kroll-Hess Hamiltonian, generalized Hartree-Fock method and all-electron relativistic double-ζ level basis set. Then, spin-orbit coupling (SOC) corrections to the electrophilicity index, chemical potential, hardness and softness are calculated. It is revealed that spin-orbit correction to the vertical chemical hardness has important effect on Au3 and Au6, i.e. SOC decreases (increases) the hardness of gold trimer (hexamer). Due to the relationship between hardness and softness, σ = , inclusion of spin-orbit coupling increases (decreases) the softness of Au3 (Au6) and thus destabilizes (stabilizes) it. Spin-orbit coupling (SOC) also has more important effect on the chemical potential of Au3 by decreasing its value. It is found that spin-orbit coupling has considerable effect on the electrophilicity index of gold trimer and greatly increases its value. Furthermore, SOC increases the maximal charge acceptance of Au3 more and thus destabilizes it more. As a result, spin-orbit coupling effect appears to be important in calculating the electrophilicity index of the gold trimer. Doi: 10.28991/HIJ-2021-02-01-05 Full Text: PDF

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Jiang, Kun. "Correlation Renormalized and Induced Spin-Orbit Coupling". Chinese Physics Letters 40, nr 1 (1.01.2023): 017102. http://dx.doi.org/10.1088/0256-307x/40/1/017102.

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Interplay of spin-orbit coupling (SOC) and electron correlation generates a bunch of emergent quantum phases and transitions, especially topological insulators and topological transitions. We find that electron correlation will induce extra large SOC in multi-orbital systems under atomic SOC and change ground state topological properties. Using the Hartree–Fock mean field theory, phase diagrams of px /py orbital ionic Hubbard model on honeycomb lattice are well studied. In general, correction of strength of SOC δ λ ∝ (Uʹ–J). Due to breaking down of rotation symmetry, form of SOC on multi-orbital materials is also changed under correlation. If a non-interacting system is close to fermionic instability, spontaneous generalized SOC can also be found. Using renormalization group, SOC is leading instability close to quadratic band-crossing point. Mean fields at quadratic band-crossing point are also studied.

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Huang, Peihao, i Xuedong Hu. "Spin manipulation and decoherence in a quantum dot mediated by a synthetic spin–orbit coupling of broken T-symmetry". New Journal of Physics 24, nr 1 (30.12.2021): 013002. http://dx.doi.org/10.1088/1367-2630/ac430c.

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Abstract The electrical control of a spin qubit in a quantum dot (QD) relies on spin–orbit coupling (SOC), which could be either intrinsic to the underlying crystal lattice or heterostructure, or extrinsic via, for example, a micro-magnet. In experiments, micromagnets have been used as a synthetic SOC to enable strong coupling of a spin qubit in quantum dots with electric fields. Here we study theoretically the spin relaxation, pure dephasing, spin manipulation, and spin–photon coupling of an electron in a QD due to the synthetic SOC induced spin–orbit mixing. We find qualitative difference in the spin dynamics in the presence of a synthetic SOC compared with the case of the intrinsic SOC. Specifically, spin relaxation due to the synthetic SOC and deformation potential phonon emission (or Johnson noise) shows B 0 5 (or B 0) dependence with the magnetic field, which is in contrast with the B 0 7 (or B 0 3 ) dependence in the case of the intrinsic SOC. Moreover, charge noise induces fast spin dephasing to the first order of the synthetic SOC, which is in sharp contrast with the negligible spin pure dephasing in the case of the intrinsic SOC. These qualitative differences are attributed to the broken time-reversal symmetry (T-symmetry) of the synthetic SOC. An SOC with broken T-symmetry (such as the synthetic SOC from a micro-magnet) eliminates the ‘Van Vleck cancellation’ and causes a finite longitudinal spin–electric coupling that allows the longitudinal coupling between spin and electric field, and in turn allows spin pure dephasing. Finally, through proper choice of magnetic field orientation, the electric-dipole spin resonance via the synthetic SOC can be improved with potential applications in spin-based quantum computing.

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Zhang, Ning, Yunlong Xiao i Wenjian Liu. "SOiCI and iCISO: combining iterative configuration interaction with spin–orbit coupling in two ways". Journal of Physics: Condensed Matter 34, nr 22 (1.04.2022): 224007. http://dx.doi.org/10.1088/1361-648x/ac5db4.

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Abstract The near-exact iCIPT2 approach for strongly correlated systems of electrons, which stems from the combination of iterative configuration interaction (iCI, an exact solver of full CI) with configuration selection for static correlation and second-order perturbation theory (PT2) for dynamic correlation, is extended to the relativistic domain. In the spirit of spin separation, relativistic effects are treated in two steps: scalar relativity is treated by the infinite-order, spin-free part of the exact two-component (X2C) relativistic Hamiltonian, whereas spin–orbit coupling (SOC) is treated by the first-order, Douglas–Kroll–Hess-like SOC operator derived from the same X2C Hamiltonian. Two possible combinations of iCIPT2 with SOC are considered, i.e., SOiCI and iCISO. The former treats SOC and electron correlation on an equal footing, whereas the latter treats SOC in the spirit of state interaction, by constructing and diagonalizing an effective spin–orbit Hamiltonian matrix in a small number of correlated scalar states. Both double group and time reversal symmetries are incorporated to simplify the computation. Pilot applications reveal that SOiCI is very accurate for the spin–orbit splitting (SOS) of heavy atoms, whereas the computationally very cheap iCISO can safely be applied to the SOS of light atoms and even of systems containing heavy atoms when SOC is largely quenched by ligand fields.

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Klebl, Lennart, Qiaoling Xu, Ammon Fischer, Lede Xian, Martin Claassen, Angel Rubio i Dante M. Kennes. "Moiré engineering of spin–orbit coupling in twisted platinum diselenide". Electronic Structure 4, nr 1 (14.02.2022): 014004. http://dx.doi.org/10.1088/2516-1075/ac49f5.

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Abstract We study the electronic structure and correlated phases of twisted bilayers of platinum diselenide using large-scale ab initio simulations combined with the functional renormalization group. PtSe2 is a group-X transition metal dichalcogenide, which hosts emergent flat bands at small twist angles in the twisted bilayer. Remarkably, we find that Moiré engineering can be used to tune the strength of Rashba spin–orbit interactions, altering the electronic behavior in a novel manner. We reveal that an effective triangular lattice with a twist-controlled ratio between kinetic and spin–orbit coupling (SOC) scales can be realized. Even dominant SOC can be accessed in this way and we discuss consequences for the interaction driven phase diagram, which features pronounced exotic superconducting and entangled spin-charge density waves.

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Griesbeck, Axel, i Seyma Bozkus. "Spin Photochemistry: Electron Spin Multiplicity as a Tool for Reactivity and Selectivity Control". CHIMIA 75, nr 10 (11.10.2021): 868. http://dx.doi.org/10.2533/chimia.2021.868.

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Spin chemistry involving small organic molecules without heavy atoms is highly sensitive to spin-orbit-coupling (SOC) modulating biradical conformation as well as hyperfine coupling (HFC) modulating magnetic isotope interactions. Several easily available reaction properties such as chemo-, regio-, and diastereoselectivity as well as quantum yields serve as analytical tools to follow intersystem crossing dynamics and allows titrating spin selectivities.

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Nan, T., T. J. Anderson, J. Gibbons, K. Hwang, N. Campbell, H. Zhou, Y. Q. Dong i in. "Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design". Proceedings of the National Academy of Sciences 116, nr 33 (26.07.2019): 16186–91. http://dx.doi.org/10.1073/pnas.1812822116.

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Spin-orbit coupling (SOC), the interaction between the electron spin and the orbital angular momentum, can unlock rich phenomena at interfaces, in particular interconverting spin and charge currents. Conventional heavy metals have been extensively explored due to their strong SOC of conduction electrons. However, spin-orbit effects in classes of materials such as epitaxial 5d-electron transition-metal complex oxides, which also host strong SOC, remain largely unreported. In addition to strong SOC, these complex oxides can also provide the additional tuning knob of epitaxy to control the electronic structure and the engineering of spin-to-charge conversion by crystalline symmetry. Here, we demonstrate room-temperature generation of spin-orbit torque on a ferromagnet with extremely high efficiency via the spin-Hall effect in epitaxial metastable perovskite SrIrO3. We first predict a large intrinsic spin-Hall conductivity in orthorhombic bulk SrIrO3 arising from the Berry curvature in the electronic band structure. By manipulating the intricate interplay between SOC and crystalline symmetry, we control the spin-Hall torque ratio by engineering the tilt of the corner-sharing oxygen octahedra in perovskite SrIrO3 through epitaxial strain. This allows the presence of an anisotropic spin-Hall effect due to a characteristic structural anisotropy in SrIrO3 with orthorhombic symmetry. Our experimental findings demonstrate the heteroepitaxial symmetry design approach to engineer spin-orbit effects. We therefore anticipate that these epitaxial 5d transition-metal oxide thin films can be an ideal building block for low-power spintronics.

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Jia, Yi-zhen, Wei-xiao Ji, Chang-wen Zhang, Shu-feng Zhang, Ping Li i Pei-ji Wang. "Films based on group IV–V–VI elements for the design of a large-gap quantum spin Hall insulator with tunable Rashba splitting". RSC Advances 7, nr 19 (2017): 11636–43. http://dx.doi.org/10.1039/c6ra28838c.

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FU, XI, i GUANG-HUI ZHOU. "SPIN ACCUMULATION IN A QUANTUM WIRE WITH THE COEXISTENCE OF RASHBA AND DRESSELHAUSE SPIN–ORBIT COUPLING". International Journal of Modern Physics B 25, nr 26 (20.10.2011): 3495–502. http://dx.doi.org/10.1142/s0217979211101338.

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We investigate theoretically the spin accumulation of a quantum wire nonadiabatically connected to two normal leads in the presence of Rashba and Dresselhaus spin–orbit coupling (SOC). Using scattering matrix approach within the effective free-electron approximation, three components of spin polarization have been calculated. It is demonstrated that for the Dresselhaus SOC case the out-of-plane spin polarization does not form spin accumulation, and when the two SOC terms coexist the influence of Rashba SOC to the out-of-plane spin accumulation is dominant and symmetry of the spin accumulation is broken due to the existence of Dresselhaus SOC. Moreover, the formation of the out-of-plane spin accumulation is influenced by the ratio of Rashba and Dresselhaus strength, and when the ratio is very small the out-of-plane spin polarization does not show spin accumulation patterns. It is also shown that the spin accumulation for the system is an intrinsic one which can be distinguished from the extrinsic spin accumulation by changing the Rashba strength.

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Singh, Ranber. "Spin–orbit splitting in graphene, silicene and germanene: Dependence on buckling". International Journal of Modern Physics B 32, nr 05 (luty 2018): 1850055. http://dx.doi.org/10.1142/s0217979218500558.

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The spin–orbit splitting (E[Formula: see text]) of valence band maximum at the [Formula: see text] point is significantly smaller in 2D planner honeycomb structures of graphene, silicene, germanene and BN than that in the corresponding 3D bulk counterparts. For 2D planner honeycomb structure of SiC, it is almost same as that for 3D bulk cubic SiC. The bandgap which opens at the K and K[Formula: see text] points due to spin–orbit coupling (SOC) is very small in flat honeycomb structures of graphene and silicene, while in germanene it is about 2 meV. The buckling in these structures of graphene, silicene and germanene increases the bandgap opened at the K and K[Formula: see text] points due to SOC quadratically, while the E[Formula: see text] of valence band maximum at the [Formula: see text] point decreases quadratically with an increase in the magnitude of buckling.

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Xiao, Yun-Chang, Ri-Xing Wang i Ru-Shu Yang. "Dresselhaus spin-orbit coupling modulating pumps driven by triple potentials". Modern Physics Letters B 28, nr 19 (25.07.2014): 1450159. http://dx.doi.org/10.1142/s0217984914501590.

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In this paper, Dresselhaus spin-orbit coupling (SOC) modulating quantum pumps driven by triple time-dependent potentials are investigated, where the pump center are semiconductors connected to two normal leads. In detail, the parametric influence to the quantum pump current is studied by using the Floquet scattering technology, and mainly via the modulations of the potentials position, the SOC strength and component, the tunable currents pumped from the system are discussed.

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Yang, Rong, Bin Tang i XiangYu Han. "Ab initio theory study of laser cooling of barium monohalides". RSC Advances 10, nr 35 (2020): 20778–83. http://dx.doi.org/10.1039/d0ra02211j.

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Shao, Ziji, Yanping Huang, Defang Duan, Yanbin Ma, Hongyu Yu, Hui Xie, Da Li, Fubo Tian, Bingbing Liu i Tian Cui. "Stable structures and superconductivity of an At–H system at high pressure". Physical Chemistry Chemical Physics 20, nr 38 (2018): 24783–89. http://dx.doi.org/10.1039/c8cp04317e.

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The phase diagram, electronic properties and superconductivity of an At–H system at high pressure are investigated through first principles calculation considering the effect of spin–orbit coupling (SOC).

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Zhao, Duo, Xiaolei Wang, Zhijie Wang i Dahai Wei. "Tuning superconductivity with spin–orbit coupling and proximity effects in ferromagnet/superconductor/ heavy metal heterostructures". Journal of Physics D: Applied Physics 55, nr 17 (31.01.2022): 175301. http://dx.doi.org/10.1088/1361-6463/ac4cf6.

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Abstract In superconducting/ferromagnet heterostructures, spin-triplet Cooper pairs that carry spin information are crucial for the realization of superconducting spintronics. It has been theoretically proposed that they can be generated and controlled by the magnetic proximity effect and spin–orbit coupling (SOC), resulting in a change in the critical temperature (T C). However, experiments are still lacking, which limits the development of device applications. Here, we fabricate a series of Co/Nb/Pt heterostructures and reference samples, where the SOC and magnetic proximity can be independently controlled. We found the suppression of T C up to 11% by the different Rashba-SOC at the Nb/Pt and Nb/Cu interfaces, and the normalized T C/T C 0 was successfully tuned by 24% with the coeffect of SOC and magnetic proximity. Through rigorous comparison, we attribute the tuning of superconductivity to the spin-triplet Cooper pairs, which is controlled by both the SOC strength and magnetic proximity. Our results offer a new pathway to control superconductivity with SOC and pave a new direction for the design of superconducting spintronics devices.

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Safeer, C. K., Franz Herling, Won Young Choi, Nerea Ontoso, Josep Ingla-Aynés, Luis E. Hueso i Fèlix Casanova. "Reliability of spin-to-charge conversion measurements in graphene-based lateral spin valves". 2D Materials 9, nr 1 (9.12.2021): 015024. http://dx.doi.org/10.1088/2053-1583/ac3c9b.

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Abstract Understanding spin physics in graphene is crucial for developing future two-dimensional spintronic devices. Recent studies show that efficient spin-to-charge conversions (SCCs) via either the inverse spin Hall effect or the inverse Rashba–Edelstein effect (IREE) can be achieved in graphene by proximity with an adjacent spin–orbit coupling (SOC) material. Lateral spin valve devices, made up of a graphene Hall bar and ferromagnets, are best suited for such studies. Here, we report that signals mimicking the IREE can be measured in pristine graphene possessing negligible SOC, confirming that these signals are unrelated to SCC. We identify either the anomalous Hall effect in the ferromagnet or the ordinary Hall effect in graphene induced by stray fields as the possible sources of this artefact. By quantitatively comparing these options with finite-element-method simulations, we conclude the latter better explains our results. Our study deepens the understanding of SCC measurement schemes in graphene, which should be taken into account when designing future experiments.

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Xiong, Wenqi, Congxin Xia, Yuting Peng, Juan Du, Tianxing Wang, Jicai Zhang i Yu Jia. "Spin–orbit coupling effects on electronic structures in stanene nanoribbons". Physical Chemistry Chemical Physics 18, nr 9 (2016): 6534–40. http://dx.doi.org/10.1039/c5cp07140b.

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XU, ZHONGHUI, XIANBO XIAO i YUGUANG CHEN. "SPIN-DEPENDENT ELECTRON TRANSPORT THROUGH A THREE-TERMINAL MESOSCOPIC SPIN-ORBIT COUPLED SYSTEMS". International Journal of Modern Physics B 27, nr 07 (10.03.2013): 1361003. http://dx.doi.org/10.1142/s0217979213610031.

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We studied theoretically the spin-dependent electron transport properties of a three-terminal nanostructure proposed by Xiao and Chen [J. Appl. Phys.1, 108 (2010)]. The spin-resolved recursive Green's function method is used to calculate the three-terminal spin-polarization. We focus on the influence both of the structural parameters and Rashba spin–orbit coupling (SOC) strength in the investigated system. It is shown that the spin-polarization is still a reasonable value for being observable in experiment with small Rashba SOC strength and longer length of the wide region in the investigated system. The underlying physics is revealed to originate from the effect of SOC-induced effective magnetic field at the structure-induced Fano resonance. This length of the middle wide region in three-terminal nanostructure can be more easily fabricated experimentally.

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Guo, San-Dong. "Thermoelectric properties of half-Heusler ZrNiPb by using first principles calculations". RSC Advances 6, nr 53 (2016): 47953–58. http://dx.doi.org/10.1039/c6ra08461c.

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We investigate the electronic structures and thermoelectric properties of a recently synthesized half-Heusler ZrNiPb compound by using a generalized gradient approximation (GGA) and GGA plus spin–orbit coupling (GGA + SOC).

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Fu, Xi, Wenhu Liao i Guanghui Zhou. "Spin Accumulation in a Quantum Wire with Rashba Spin-Orbit Coupling". Advances in Condensed Matter Physics 2008 (2008): 1–5. http://dx.doi.org/10.1155/2008/152731.

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We investigate theoretically the spin accumulation in a Rashba spin-orbit coupling quantum wire. Using the scattering matrix approach within the effective free-electron approximation, we have demonstrated the three components of spin polarization. It is found that by a few numerical examples, the two peaks for the out-of-plane spin accumulation〈Sz〉shift to the edges of quantum wire with the increase of propagation modes. The period of intrinsic oscillations〈Sx/y〉inversely proportions to the Rashba SOC strength. This effect may be used to differentiate the intrinsic spin accumulation from the extrinsic one.

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Gaggioli, Carlo Alberto, Leonardo Belpassi, Francesco Tarantelli, Daniele Zuccaccia, Jeremy N. Harvey i Paola Belanzoni. "Dioxygen insertion into the gold(i)–hydride bond: spin orbit coupling effects in the spotlight for oxidative addition". Chemical Science 7, nr 12 (2016): 7034–39. http://dx.doi.org/10.1039/c6sc02161a.

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Tyagi, Udai Prakash, Kakoli Bera i Partha Goswami. "Fledgling Quantum Spin Hall Effect in Pseudo Gap Phase of Bi2212". Symmetry 14, nr 8 (22.08.2022): 1746. http://dx.doi.org/10.3390/sym14081746.

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We studied the emergence of the quantum spin Hall (QSH) states for the pseudo-gap (PG) phase of Bi2212 bilayer system, assumed to be D-density wave (DDW) ordered, starting with a strong Rashba spin-orbit coupling (SOC) armed, and the time reversal symmetry (TRS) complaint Bloch Hamiltonian. The presence of strong SOC gives rise to non-trivial, spin-momentum locked spin texture tunable by electric field. The emergence of quantum anomalous Hall effect with TRS broken Chiral DDW Hamiltonian of Das Sarma et al. is found to be possible.

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Sharma, Chithra H., Pai Zhao, Lars Tiemann, Marta Prada, Arti Dangwal Pandey, Andreas Stierle i Robert H. Blick. "Electron spin resonance in a proximity-coupled MoS₂/graphene van der Waals heterostructure". AIP Advances 12, nr 3 (1.03.2022): 035111. http://dx.doi.org/10.1063/5.0077077.

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Coupling graphene’s excellent electron and spin transport properties with a higher spin–orbit coupling (SOC) material allows tackling the hurdle of spin manipulation in graphene due to the proximity to van der Waals layers. Here, we use magneto-transport measurements to study the electron spin resonance on a combined system of graphene and MoS2 at 1.5 K. The electron spin resonance measurements are performed in the frequency range of 18–33 GHz, which allows us to determine the g-factor in the system. We measure the average g-factor of 1.91 for our hybrid system, which is a considerable shift compared to that observed in graphene on SiO2. This is a clear indication of proximity induced SOC in graphene in accordance with theoretical predictions.

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Gaggioli, Carlo Alberto, Leonardo Belpassi, Francesco Tarantelli, Jeremy N. Harvey i Paola Belanzoni. "The ligand effect on the oxidative addition of dioxygen to gold(i)–hydride complexes". Dalton Transactions 46, nr 35 (2017): 11679–90. http://dx.doi.org/10.1039/c7dt02170d.

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The activation energy barriers of the O₂ to [LAuH] oxidative addition, calculated by including spin–orbit coupling (SOC) effects, quantitatively correlate with the σ donation component of the L–AuH bond.

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Santana-Suárez, E., i F. Mireles. "Impact of the p-cubic Dresselhaus term on the spin Hall effect". Condensed Matter Physics 26, nr 1 (2023): 13504. http://dx.doi.org/10.5488/cmp.26.13504.

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It is well known that the Dresselhaus spin-orbit coupling (SOC) in semiconductor two dimensional electron gases (2DEGs) possesses both linear and cubic in momentum contributions. Nevertheless, the latter is usually neglected in most theoretical studies. However, recent Kerr rotation experiments have revealed a significant enhancement of the cubic Dresselhaus interaction by increasing the drift velocities in 2DEGs hosted in GaAs quantum wells. Here, we present a study of the optical spin Hall conductivity in 2DEGs under the simultaneous presence of Rashba and (linear plus cubic) Dresselhaus SOC. The work was done within the Kubo formalism in linear response. We show that the coexistence of the Rashba and cubic Dresselhaus SOC in 2DEGs promotes a strong anisotropy of the band spin splitting which in turn leads to a very characteristic frequency dependence of the spin Hall conductivity. We find that the spin Hall conductivity response could be very sensible to sizeable cubic-Dresselhaus coupling strength. This may be of relevance for the optical control of spin currents in 2DEGs with non-negligible cubic-Dresselhaus SOC.

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Liu, Qi, i WanZhen Liang. "Structure and property tunability in monolayer halide lead-free double hybrid perovskites: effects of Rashba and biaxial strain". Journal of Materials Chemistry A 7, nr 18 (2019): 11487–96. http://dx.doi.org/10.1039/c9ta01647c.

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Due to the unequal effect of spin–orbit coupling (SOC) interaction on the band structure, pristine MA₄[AgBi]Br₈ possesses an indirect band gap. However, both its band gap and SOC effect are sensitive to the strain, and >%2 stretching ratio can turn it into a direct-band semiconductor.

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Kore, Ashish, Nisa Ara i Poorva Singh. "First principle based investigation of topological insulating phase in half-Heusler family NaYO (Y = Ag, Au, and Cu)". Journal of Physics: Condensed Matter 34, nr 20 (17.03.2022): 205501. http://dx.doi.org/10.1088/1361-648x/ac57d7.

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Abstract The ternary half-Heusler compounds have shown great potential for realizing new 3D topological insulators. With band gap tuning and spin orbit coupling these compounds may undergo topological phase transitions. In present work, we explore the possibility of realizing a topological insulating phase in half-Heusler family NaYO (Y = Ag, Au, and Cu). We find that for NaAgO, external strain (∼19%) along with spin–orbit coupling (SOC), is required to achieve band-inversion at Γ high-symmetry point and leads to phase transition from trivial to non-trivial topological insulating phase. In case of NaAuO and NaCuO, non-trivial phase appears in their equilibrium lattice constant, hence only SOC is enough to achieve band-inversion leading to non-trivial topology. The non-centrosymmetric nature of crystal geometry leads to the formation of two twofold degenerate point nodes near the Fermi level.

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Fan, W. J., Z. Shi, F. L. Chen i S. M. Zhou. "Tuning Effects of Spin–Orbit Coupling in L10 Ordered and Disordered FePdPt Films". SPIN 05, nr 03 (wrzesień 2015): 1530004. http://dx.doi.org/10.1142/s2010324715300042.

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Effects of spin–orbit coupling (SOC) on magnetocrystalline anisotropy, magneto-optical Kerr effect (MOKE), magnetic damping parameter and anomalous Hall effect (AHE) have been studied in theory extensively. In contrast, few experimental reports have appeared on these issues. In this review paper, we introduce our recent experimental investigation on the SOC tuning effects on the perpendicular magnetic anisotropy, polar MOKE, intrinsic magnetic damping parameter and AHE in L10 ordered [Formula: see text] ternary alloys. We also outline the SOC effects in polycrystalline disordered [Formula: see text] films for comparison.

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Xiao, Zheng-Yu, Yong-Ji Li, Wei Zhang, Yang-Jia Han, Dong Li, Qian Chen, Zhong-Ming Zeng, Zhi-Yong Quan i Xiao-Hong Xu. "Enhancement of torque efficiency and spin Hall angle driven collaboratively by orbital torque and spin–orbit torque". Applied Physics Letters 121, nr 7 (15.08.2022): 072404. http://dx.doi.org/10.1063/5.0086125.

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Spin–orbit torque (SOT) has been extensively applied to magnetization manipulation in low power consumption logic and memory devices. However, it is believed that materials with strong spin–orbit coupling (SOC) are indispensable for magnetic torque generation. Recently, theoretical studies have indicated that the oxides of light materials with weak SOC can provide a sizable orbital torque (OT), inducing magnetization switching. Here, we experimentally report the extreme enhancement of torque efficiency and spin Hall angle through the natural oxidation of Cu with weak SOC in the perpendicularly magnetized Pt/Co/Cu–CuO x multilayers. The values of torque efficiency and spin Hall angle increase by approximately five times by tuning the surface oxidation at room temperature. The comparative analysis of the effective field reveals that the significant enhancement mainly originates from the collaborative drive of the OT at the Cu/CuO x interface and the SOT from the Pt layer. This finding provides a powerful way to engineer the high-efficient spintronic devices through combining OT and SOT to improve the torque efficiency.

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Li, Hongwei, Shuxiang Wu, Dan Li, Gaili Wang, Ping Hu i Shuwei Li. "Tailoring anomalous Hall effect by spin–orbit coupling in epitaxial Au/Fe₄N bilayers". Applied Physics Letters 121, nr 26 (26.12.2022): 262401. http://dx.doi.org/10.1063/5.0120075.

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Anomalous Hall effect (AHE) is one of the most fascinating topics in condensed matter physics related to spin–orbit coupling (SOC). In this paper, we report on the AHE of high-quality epitaxial Au/Fe4N bilayer films, which were grown by a plasma-assisted molecular beam epitaxy system. A scaling involving multiple competing scattering mechanisms and a shunting model were adopted to analyze the AHE in detail. Compared with Fe4N single layers and Cu/Fe4N bilayers, the AHE of Au/Fe4N bilayers is dramatically modified by strong SOC of the Au layer. Analysis has shown that aside from extra scatterings from Au atoms that diffused from an Au layer to a Fe4N layer, both spin Hall effect of Au and magnetic proximity effect near the Au/Fe4N interface contribute to the modification of the AHE. Variation of coercivity with the change of current, which could be attributed to spin–orbit torque, implies that the measured AHE is a combination of the AHE of Fe4N and strong SOC of Au.

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30

Chen, Liang. "Hall effects in monolayer MoS2 with spin-orbit coupling under the shining of a circularly polarized light". Modern Physics Letters B 34, nr 16 (31.03.2020): 2050181. http://dx.doi.org/10.1142/s021798492050181x.

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In this paper, we study Hall effects of the monolayer MoS2 with Rashba and Ising spin-orbit coupling (SOC) under the application of a circularly polarized light. The Chern number and spin textures at high frequency regime are studied based on the Floquet theory. We found that the SOCs induced valley Hall effect. The sign of Chern numbers at high frequency regime can be reversed by engineering interplay between Ising SOC and light intensity. The system undergoes a topological phase transition from valley Hall state to anomalous Hall state. By analyzing the spin texture, we study the origin of the Hall effects.

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31

Fan, Yabin, i Kang L. Wang. "Spintronics Based on Topological Insulators". SPIN 06, nr 02 (czerwiec 2016): 1640001. http://dx.doi.org/10.1142/s2010324716400014.

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Spintronics using topological insulators (TIs) as strong spin–orbit coupling (SOC) materials have emerged and shown rapid progress in the past few years. Different from traditional heavy metals, TIs exhibit very strong SOC and nontrivial topological surface states that originate in the bulk band topology order, which can provide very efficient means to manipulate adjacent magnetic materials when passing a charge current through them. In this paper, we review the recent progress in the TI-based magnetic spintronics research field. In particular, we focus on the spin–orbit torque (SOT)-induced magnetization switching in the magnetic TI structures, spin–torque ferromagnetic resonance (ST-FMR) measurements in the TI/ferromagnet structures, spin pumping and spin injection effects in the TI/magnet structures, as well as the electrical detection of the surface spin-polarized current in TIs. Finally, we discuss the challenges and opportunities in the TI-based spintronics field and its potential applications in ultralow power dissipation spintronic memory and logic devices.

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32

Wang, Zhen-Hua, Fuming Xu, Lin Li, Dong-Hui Xu, Wei-Qiang Chen, Bin Wang i Hong Guo. "Spin–orbit proximity effect and topological superconductivity in graphene/transition-metal dichalcogenide nanoribbons". New Journal of Physics 23, nr 12 (1.12.2021): 123002. http://dx.doi.org/10.1088/1367-2630/ac33f5.

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Abstract Spin–orbit coupling (SOC) plays a determinate role in spintronics and topological physics. Previous studies indicate that the SOC in graphene nanoribbon (GNR) can be enhanced by the proximity effect from two-dimensional transition-metal dichalcogenide (2D-TMD). However, the bulk inversion symmetry of GNR/2D-TMD restricts further increase of the proximity-induced SOC in GNR. In this view, we introduce a TMD nanoribbon (TMDNR) with finite width, and propose three methods to break the bulk inversion symmetry, i.e. defects in TMDNR, spatial interlayer edge coupling, and twist between GNR and TMDNR, which can further enhance the SOC in the GNR by roughly 30 times, 20 times and 150 times, respectively, depending on the relative energy between the Dirac point of GNR and the states of TMDNR. Furthermore, the significantly enhanced SOC can drive the GNR into a topological superconducting phase. By introducing the Zeeman splitting and s-wave superconductivity in the GNR, quasi one-dimensional topological superconductivity and Majorana zero modes (MZMs) can be achieved in the GNR. At last we propose a feasible experimental method to realize and manipulate MZMs in the GNR/TMDNR system.

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33

Chen, Xu-Lin, Rongmin Yu, Xiao-Yuan Wu, Dong Liang, Ji-Hui Jia i Can-Zhong Lu. "Correction: A strongly greenish-blue-emitting Cu4Cl4 cluster with an efficient spin–orbit coupling (SOC): fast phosphorescence versus thermally activated delayed fluorescence". Chemical Communications 52, nr 49 (2016): 7738. http://dx.doi.org/10.1039/c6cc90240e.

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Correction for ‘A strongly greenish-blue-emitting Cu₄Cl₄ cluster with an efficient spin–orbit coupling (SOC): fast phosphorescence versus thermally activated delayed fluorescence’ by Xu-Lin Chen et al., Chem. Commun., 2016, 52, 6288–6291.

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34

Rømer, A. T., i B. M. Andersen. "Fluctuation-driven superconductivity in Sr2RuO4 from weak repulsive interactions". Modern Physics Letters B 34, nr 19n20 (8.07.2020): 2040052. http://dx.doi.org/10.1142/s0217984920400527.

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We provide results for the leading superconducting instabilities for a model pertaining to [Formula: see text] obtained within spin-fluctuation mediated superconductivity in the very weak-coupling limit. The theory incorporates spin–orbit coupling (SOC) effects both in the band structure and in the pairing kernel in the form of associated magnetic anisotropies. The leading superconducting phase is found to be [Formula: see text] and a nodal [Formula: see text]-wave state. However, the odd-parity helical solution can become leading either for small SOC and Hund’s coupling [Formula: see text] in the weak [Formula: see text]-limit, or in the opposite limit with large SOC and [Formula: see text] at larger values of the Hubbard-[Formula: see text]. The odd-parity chiral solution is never found to be leading. Finally we discuss the form of the resulting superconducting spectral gaps in the different explored parameter regimes.

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35

Guedes-Sobrinho, Diego, Renato P. Orenha, Renato L. T. Parreira, Glaucio R. Nagurniak, Gabriel Reynald Da Silva i Maurício J. Piotrowski. "The effect of different energy portions on the 2D/3D stability swapping for 13-atom metal clusters". Physical Chemistry Chemical Physics 24, nr 11 (2022): 6515–24. http://dx.doi.org/10.1039/d2cp00148a.

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The complexity of Cu13, Ag13, and Au13 coinage-metal clusters was investigated through their energy contributions via a density functional theory study, considering improvements in the PBE functional, such as van der Waals (vdW) corrections, spin–orbit coupling (SOC), Hubbard term (+U), and their combinations.

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36

GONG, BAIHUA, XIN-HUI ZHANG, ER-HU ZHANG i SHENG-LI ZHANG. "SPIN-ORBIT COUPLING IN GRAPHENE UNDER UNIAXIAL STRAIN: TIGHT-BINDING APPROACH AND FIRST-PRINCIPLES CALCULATIONS". Modern Physics Letters B 25, nr 11 (10.05.2011): 823–30. http://dx.doi.org/10.1142/s0217984911026097.

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Tuning the spin-orbit coupling (SOC) in graphene is highly desired for its application in spintronics. In this paper, we calculated the band gap induced by SOC in graphene under uniaxial strain from a tight-binding model, and found that the band gap has a monotonic increasing dependence on the strain in the range of -20% to 15%. Our results suggest that strain can be used as a reversible and controllable way to tune the SOC in graphene. First-principles calculations were performed, confirming the results of tight-binding approximation.

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37

Fumanal, M., E. Gindensperger i C. Daniel. "Ligand substitution and conformational effects on the ultrafast luminescent decay of [Re(CO)3(phen)(L)]+ (L = imidazole, pyridine): non-adiabatic quantum dynamics". Physical Chemistry Chemical Physics 20, nr 2 (2018): 1134–41. http://dx.doi.org/10.1039/c7cp07540e.

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The C_s conformers of [Re(CO)₃(phen)(L)]⁺ (L = imidazole, pyridine) complexes are investigated by means of density functional theory (DFT/time-dependent DFT (TD-DFT)) electronic structure calculations and non-adiabatic quantum dynamics including spin–orbit coupling (SOC).

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38

Jekal, Soyoung, Andreas Danilo, Dao Phuong i Xiao Zheng. "First-Principles Prediction of Skyrmionic Phase Behavior in GdFe2 Films Capped by 4d and 5d Transition Metals". Applied Sciences 9, nr 4 (13.02.2019): 630. http://dx.doi.org/10.3390/app9040630.

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In atomic GdFe 2 films capped by 4d and 5d transition metals, we show that skyrmions with diameters smaller than 12 nm can emerge. The Dzyaloshinskii–Moriya interaction (DMI), exchange energy, and the magnetocrystalline anisotropy (MCA) energy were investigated based on density functional theory. Since DMI and MCA are caused by spin–orbit coupling (SOC), they are increased with 5d capping layers which exhibit strong SOC strength. We discover a skyrmion phase by using atomistic spin dynamic simulations at small magnetic fields of ∼1 T. In addition, a ground state that a spin spiral phase is remained even at zero magnetic field for both films with 4d and 5d capping layers.

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39

Marian, Christel M. "Understanding and Controlling Intersystem Crossing in Molecules". Annual Review of Physical Chemistry 72, nr 1 (20.04.2021): 617–40. http://dx.doi.org/10.1146/annurev-physchem-061020-053433.

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This review article focuses on the understanding of intersystem crossing (ISC) in molecules. It addresses readers who are interested in the phenomenon of intercombination transitions between states of different electron spin multiplicities but are not familiar with relativistic quantum chemistry. Among the spin-dependent interaction terms that enable a crossover between states of different electron spin multiplicities, spin–orbit coupling (SOC) is by far the most important. If SOC is small or vanishes by symmetry, ISC can proceed by electronic spin–spin coupling (SSC) or hyperfine interaction (HFI). Although this review discusses SSC- and HFI-based ISC, the emphasis is on SOC-based ISC. In addition to laying the theoretical foundations for the understanding of ISC, the review elaborates on the qualitative rules for estimating transition probabilities. Research on the mechanisms of ISC has experienced a major revival in recent years owing to its importance in organic light-emitting diodes (OLEDs). Exemplified by challenging case studies, chemical substitution and solvent environment effects are discussed with the aim of helping the reader to understand and thereby get a handle on the factors that steer the efficiency of ISC.

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40

Jia, Hong Ying, Xue Fang Dai, Li Ying Wang, Fang Wang, Lei Chen, Xiao Chuang Liu i Guo Dong Liu. "The Effect of Spin-Orbit Coupling on the Electronic Structures and Half-Metallicity of Heusler Compounds: V₂ReZ (Z=Al, Ga, ln)". Advanced Materials Research 683 (kwiecień 2013): 211–17. http://dx.doi.org/10.4028/www.scientific.net/amr.683.211.

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We have studied the influence of spin-orbit coupling (SOC) on the electronic structures and half-metallicity for the V2ReZ (Z=Al, Ga, In) compounds. It was found that the SOC has a slight influence on the whole configuration of the electronic structure and the degenerated states were split into several singlet states at the high-symmetry points. The egand t1ustates near the Fermi level are not sensitive to the SOC. The t2gstates composed of the side of half-metallic gap are sensitive to the SOC. The dispersivity of t2gstates was strongly reduced, which lead to an increase of the valence electron effective mass and the width of half-metallic gap. The SOC can slightly increase the spin splitting of Re and V(B) atoms. The Z atom has an influence on the intensity of SOC to act on half-metallic gap.

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41

Bhandari, Shalika Ram, Sarita Lawaju, Santosh KC, Gopi Chandra Kaphle i Madhav Prasad Ghimire. "Electronic Structure and Magnetic Properties of Double Perovskites Ca2MnIrO6". BIBECHANA 19, nr 1-2 (12.09.2022): 127–32. http://dx.doi.org/10.3126/bibechana.v19i1-2.46404.

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Using the density functional theory formalism, electronic and magnetic properties of double perovskites Ca2MnIrO6 are investigated. We found ferrimagnetic ground state with half-metallic nature in Ca2MnIrO6. The electron-correlation, crystal distortion, and spin-orbit coupling (SOC) plays significant role in dictating the electronic properties in this system. From the density of states calculations, a strong hybridization were noted between O-2p, Ir-5d and Mn-3d states resulting Ca2MnIrO6 to half-metal (HM) with metallic state in spin up channel and insulating state in spin-down channel. The HM state persists even when SOC is taken into account, though the spin-polarization reduces slightly. We thus predict Ca2MnIrO6 as a new HM ferrimagnet which can be useful for modern technological applications. We further investigated the Curie temperature of Ca2MnIrO6 by calculating the spin-exchange coupling parameters. Our results are found to be comparable with other perovskites. BIBECHANA 19 (2022) 127-132

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42

López, Alexander, Solmar Varela i Ernesto Medina. "Radiation modulated spin coupling in a double-stranded DNA model". Journal of Physics: Condensed Matter 34, nr 13 (21.01.2022): 135301. http://dx.doi.org/10.1088/1361-648x/ac48c1.

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Abstract The spin activity in macromolecules such as DNA and oligopeptides, in the context of the chiral induced spin selectivity has been proposed to be due to the atomic spin–orbit coupling (SOC) and the associated chiral symmetry of the structures. This coupling, associated with carbon, nitrogen and oxygen atoms in biological molecules, albeit small (meV), can be enhanced by the geometry, and strong local polarization effects such as hydrogen bonding. A novel way to manipulate the spin degree of freedom is by modifying the spectrum using a coupling to the appropriate electromagnetic radiation field. Here we use the Floquet formalism in order to show how the half filled band Hamiltonian for DNA, can be modulated by the radiation to produce up to a tenfold increase of the effective SOC once the intrinsic coupling is present. On the other hand, the chiral model, once incorporating the orbital angular momentum of electron motion on the helix, opens a gap for different helicity states (helicity splitting) that chooses spin polarization according to transport direction and chirality, without breaking time reversal symmetry. The observed effects are feasible in physically reasonable parameter ranges for the radiation field amplitude and frequency.

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43

Aryal, Niraj, i Efstratios Manousakis. "Role of electron correlations in some Weyl systems". Journal of Physics: Conference Series 2122, nr 1 (1.11.2021): 012002. http://dx.doi.org/10.1088/1742-6596/2122/1/012002.

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Abstract We are discussing a model to understand previously obtained results on Weyl semimetals as realized in MoTe2 using DFT and DFT+U calculations. The model is motivated from general principles and we use it to investigate the effects of Coulomb correlations originating from the localized nature of the Mo-d orbitals. We find that such correlations can eliminate or create pairs of Weyl points as the strength of the Coulomb interaction is varied. The effect of the spin-orbit coupling (SOC) is to split each Weyl point, which is assumed present in the absence of SOC, into pairs of spin-chiral partners.

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44

Lv, Ming-Hao, Chang-Ming Li i Wei-Feng Sun. "Spin-Orbit Coupling and Spin-Polarized Electronic Structures of Janus Vanadium-Dichalcogenide Monolayers: First-Principles Calculations". Nanomaterials 12, nr 3 (24.01.2022): 382. http://dx.doi.org/10.3390/nano12030382.

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Phonon and spintronic structures of monolayered Janus vanadium-dichalcogenide compounds are calculated by the first-principles schemes of pseudopotential plane-wave based on spin-density functional theory, to study dynamic structural stability and electronic spin-splitting due to spin-orbit coupling (SOC) and spin polarization. Geometry optimizations and phonon-dispersion spectra demonstrate that vanadium-dichalcogenide monolayers possess a high enough cohesive energy, while VSTe and VTe2 monolayers specially possess a relatively higher in-plane elastic coefficient and represent a dynamically stable structure without any virtual frequency of atomic vibration modes. Atomic population charges and electron density differences demonstrate that V–Te covalent bonds cause a high electrostatic potential gradient perpendicular to layer-plane internal VSTe and VSeTe monolayers. The spin polarization of vanadium 3d-orbital component causes a pronounced energetic spin-splitting of electronic-states near the Fermi level, leading to a semimetal band-structure and increasing optoelectronic band-gap. Rashba spin-splitting around G point in Brillouin zone can be specifically introduced into Janus VSeTe monolayer by strong chalcogen SOC together with a high intrinsic electric field (potential gradient) perpendicular to layer-plane. The vertical splitting of band-edge at K point can be enhanced by a stronger SOC of the chalcogen elements with larger atom numbers for constituting Janus V-dichalcogenide monolayers. The collinear spin-polarization causes the band-edge spin-splitting across Fermi level and leads to a ferrimagnetic order in layer-plane between V and chalcogen cations with higher α and β spin densities, respectively, which accounts for a large net spin as manifested more apparently in VSeTe monolayer. In a conclusion for Janus vanadium-dichalcogenide monolayers, the significant Rashba splitting with an enhanced K-point vertical splitting can be effectively introduced by a strong SOC in VSeTe monolayer, which simultaneously represents the largest net spin of 1.64 (ћ/2) per unit cell. The present study provides a normative scheme for first-principles electronic structure calculations of spintronic low-dimensional materials, and suggests a prospective extension of two-dimensional compound materials applied to spintronics.

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45

Decaroli, C., A. M. Arevalo-Lopez, C. H. Woodall, E. E. Rodriguez, J. P. Attfield, S. F. Parker i C. Stock. "(C4H12N2)[CoCl4]: tetrahedrally coordinated Co2+without the orbital degeneracy". Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 71, nr 1 (20.01.2015): 20–24. http://dx.doi.org/10.1107/s2052520614024809.

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We report on the synthesis, crystal structure and magnetic properties of a previously unreported Co2+S = {3\over 2} compound, (C4H12N2)[CoCl4], based upon a tetrahedral crystalline environment. The S = {3\over 2} magnetic ground state of Co2+, measured with magnetization, implies an absence of spin-orbit coupling and orbital degeneracy. This contrasts with compounds based upon an octahedral and even known tetrahedral Co2+[Cottonet al.(1961).J. Am. Chem. Soc.83, 4690] systems where a sizable spin-orbit coupling is measured. The compound is characterized with single-crystal X-ray diffraction, magnetic susceptibility, IR and UV–vis spectroscopy. Magnetic susceptibility measurements find no magnetic ordering above 2 K. The results are also compared with the previously known monoclinic hydrated analogue.

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46

Yang, Shuai-Quan, Mao-Wang Lu, Qing-Meng Guo, Ying-Jie Qin i Shi-Shi Xie. "Manipulating Electron-Spin Polarization via a δ-Potential in an Embedded Magnetic-Electric-Barrier Microstructure". Journal of Nanoelectronics and Optoelectronics 16, nr 9 (1.09.2021): 1417–22. http://dx.doi.org/10.1166/jno.2021.3094.

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We theoretically explore how to manipulate electron-spin polarization by a δ-potential in an embedded magnetic-electric-barrier microstructure (EMEBM), which can be fabricated experimentally by patterning a ferromagnetic (FM) stripe and a Schottky-metal (SM) stripe on top and bottom of GaAs/AlxGa1_xAs heterostructure, respectively. Due to spin-orbit coupling (SOC) an appreciable electron-spin polarization effect still remains, even through a δ-potential is contained. Besides, electron-spin polarization ratio can be controlled by δ-potential, which may result in a structurally-manipulable electron-spin filter for spintronics device applications.

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47

Wang, Xiaotian, Gaungqian Ding, Zhenxiang Cheng, Xiao-Lin Wang, Gang Zhang i Tie Yang. "Intersecting nodal rings in orthorhombic-type BaLi2Sn compound". Journal of Materials Chemistry C 8, nr 16 (2020): 5461–66. http://dx.doi.org/10.1039/d0tc00504e.

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In this study, via first-principles, we predict that a recently synthesized BaLi₂Sn material with Pmmn structure is a TNLS with perfect intersecting nodal rings in the k_x = 0 and k_y = 0 planes when the spin–orbit coupling (SOC) effect is ignored.

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48

Sharma, Vinay, Prabesh Bajracharya, Anthony Johnson i Ramesh C. Budhani. "Interface-driven spin pumping and inverse Rashba-Edelstein effect in FeGaB/Ag/BiSb multilayers". AIP Advances 12, nr 3 (1.03.2022): 035028. http://dx.doi.org/10.1063/9.0000311.

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Spin-orbit-coupling (SOC) plays a critical role in spin-to-charge conversion (SCC) mechanism. The SCC process is usually investigated by injecting a spin current from ferromagnet (FM) into a large SOC normal metal (SOC-NM) and then measuring the voltage generated by inverse spin Hall effect (ISHE). Recently, a new mechanism of SCC at inversion symmetry breaking interfaces between topological insulators (TIs) and magnetically ordered materials has been introduced, which is driven by the inverse Rashba-Edelstein effect (IREE). Motivated by this result, we have investigated the IREE effect of a simple binary three-dimensional TI Bi85Sb15 (BiSb). The model system used here is a trilayer of FeGaB/Ag/BiSb with different Ag thickness made insitu with a combination of dc magnetron sputtering and pulsed laser ablation. The SCC efficiency has been evaluated by measuring ferromagnetic resonance (FMR) driven ISHE voltage and extraction of the Gilbert damping (α) and interfacial spin mixing conductance (g↑↓) from the FMR line shape analysis. It is interesting to note that the charge current (Ic) increases with Ag thickness. This observation indicated that the IREE process at the Ag/BiSb interface dominates over ISHE in the bulk of BiSb film. The conversion efficiency of IREE is determined by calculating the IREE length (λIREE), which increases with the thickness of the Ag layer. These findings offer a method to generate and detect the IREE in a room temperature deposited heterostructure using simple coplanar waveguide setup.

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Lin, Jiang-Xiazi, Ya-Hui Zhang, Erin Morissette, Zhi Wang, Song Liu, Daniel Rhodes, K. Watanabe, T. Taniguchi, James Hone i J. I. A. Li. "Spin-orbit–driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene". Science 375, nr 6579 (28.01.2022): 437–41. http://dx.doi.org/10.1126/science.abh2889.

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Strong electron correlation and spin-orbit coupling (SOC) can have a profound influence on the electronic properties of materials. We examined their combined influence on a two-dimensional electronic system at the atomic interface between magic-angle twisted bilayer graphene and a tungsten diselenide crystal. We found that strong electron correlation within the moiré flatband stabilizes correlated insulating states at both quarter and half filling, and that SOC transforms these Mott-like insulators into ferromagnets, as evidenced by a robust anomalous Hall effect with hysteretic switching behavior. The coupling between spin and valley degrees of freedom could be demonstrated through control of the magnetic order with an in-plane magnetic field or a perpendicular electric field. Our findings establish an experimental knob to engineer topological properties of moiré bands in twisted bilayer graphene and related systems.

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50

Wang, Kewei, Hui Jin, Yunbin Lei, Yuan Zhao, Kaiyu Huang i Siliu Xu. "Two-Dimensional Solitons in Bose–Einstein Condensates with Spin–Orbit Coupling and Rydberg–Rydberg Interaction". Photonics 9, nr 5 (21.04.2022): 283. http://dx.doi.org/10.3390/photonics9050283.

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Applying an imaginary time evolution method (AITEM) to the system of Gross–Pitaevskii equations, we find two-dimensional stable solitons in binary atomic Bose–Einstein condensates with spin–orbit coupling (SOC) and the Rydberg–Rydberg interaction (RRI). The stability of 2D solitons by utilizing their norm and energy is discussed in detail. Depending on the SOC and Rydberg–Rydberg interaction, we find stable zero-vorticity and vortical solitons. Furthermore, we show that the solitons can be effectively tuned by the local and nonlocal nonlinearities of this system.

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