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Artykuły w czasopismach na temat „Electric dipole spin resonance”

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Data publikacji: 20 lipca 2024

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1

Gopalan, Sudha, S. Rodriguez, J. Mycielski, A. Witowski, M. Grynberg i A. Wittlin. "Electric-dipole spin resonance inn-typeCd1−xMnxSe". Physical Review B 34, nr 8 (15.10.1986): 5466–74. http://dx.doi.org/10.1103/physrevb.34.5466.

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2

Duckheim, Mathias, i Daniel Loss. "Electric-dipole-induced spin resonance in disordered semiconductors". Nature Physics 2, nr 3 (26.02.2006): 195–99. http://dx.doi.org/10.1038/nphys238.

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3

Schroth, H., K. Lassmann, Chr Borgmann i Hartmut Bracht. "Electric-Dipole Spin Resonance of Be-Doped Silicon". Materials Science Forum 258-263 (grudzień 1997): 417–22. http://dx.doi.org/10.4028/www.scientific.net/msf.258-263.417.

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4

Khomitsky D. V. i Zaprudnov N. A. "Spin-dependent tunneling in a double quantum dot in the "slow" evolution regime". Semiconductors 56, nr 10 (2022): 748. http://dx.doi.org/10.21883/sc.2022.10.55025.9875.

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The tunneling and spin dynamics is studied for the hole states in a GaAs-based double quantum dot in the presence of strong spin-orbit coupling and periodic electric field. The regimes of tunneling with the spin flip are considered for the "slow" evolution when the field frequency is lower than the other energy parameters of the stationary part of the Hamiltonian. It is found that the under such conditions the spin flip tunneling may take place at both resonant and non-resonant regimes with respect to the Zeeman level splitting. In the latter case the driving frequency may be lower compared to the resonance one, and the system dynamics resembles the Landau-Zener-Stuckelberg-Majorana interference effects arising during the dynamic level passage in isolated quantum dots. Keywords: double quantum dot, spin-orbit interaction, Zeeman splitting, tunneling, electric dipole spin resonance.
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5

Kveder, Vitaly V. "Electric-Dipole Spin Resonance on Extended Defects in Silicon". Solid State Phenomena 32-33 (grudzień 1993): 279–90. http://dx.doi.org/10.4028/www.scientific.net/ssp.32-33.279.

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6

Li, Ai-Xian, Su-Qing Duan i Wei Zhang. "Nuclear spin cooling by electric dipole spin resonance and coherent population trapping". Physica E: Low-dimensional Systems and Nanostructures 93 (wrzesień 2017): 105–10. http://dx.doi.org/10.1016/j.physe.2017.06.001.

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7

Караштин, Е. А. "Фотогальванический эффект в ферромагнетике со спин-орбитальным взаимодействием". Физика твердого тела 64, nr 9 (2022): 1311. http://dx.doi.org/10.21883/ftt.2022.09.52825.28hh.

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The effect of the appearance of an electric current induced by the electromagnetic radiation at the interface of a ferromagnet and a non-magnetic material is calculated theoretically, taking into account the Rashba spin-orbit coupling. It is shown that the electric dipole transitions between the spin subbands of the conduction electrons of a ferromagnet due to the Rashba interaction lead to a photocurrent. This current has a resonance at a frequency corresponding to the energy of the exchange splitting of spin subbands. The resonance width is determined by the spin-orbit interaction constant. The estimates made show the possibility of experimental observation of this effect in specially prepared multilayer systems.
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8

Schimpf, K., J. Palm i H. Alexander. "Electric dipole spin resonance of grain boundaries in multicrystalline silicon". Physica Status Solidi (a) 144, nr 1 (16.07.1994): 195–201. http://dx.doi.org/10.1002/pssa.2211440122.

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9

Karashtin E.A. "Photovoltaic effect in a ferromagnet with spin-orbit coupling". Physics of the Solid State 64, nr 9 (2022): 1300. http://dx.doi.org/10.21883/pss.2022.09.54170.28hh.

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The effect of the appearance of an electric current induced by the electromagnetic radiation at the interface of a ferromagnet and a non-magnetic material is calculated theoretically, taking into account the Rashba spin-orbit coupling. It is shown that the electric dipole transitions between the spin subbands of the conduction electrons of a ferromagnet due to the Rashba interaction lead to a photocurrent. This current has a resonance at a frequency corresponding to the energy of the exchange splitting of spin subbands. The resonance width is determined by the spin-orbit interaction constant. The estimates show the possibility of experimental observation of this effect in specially prepared multilayer systems. Keywords: Ferromagnet, exchange coupling, Rashba spin-orbit coupling, photovoltaic effect.
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10

Denisov K. S. i Golenitskii K. Yu. "Efficient spin generation in graphene by magnetic proximity effect upon absorption of far-IR radiation". Semiconductors 57, nr 3 (2023): 185. http://dx.doi.org/10.21883/sc.2023.03.56234.4756.

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The magnetic proximity effect is significant for atomically thin layers of two-dimensional materials. In this paper, we study the mechanisms of photogeneration spin-polarized carriers in graphene on a magnetic insulator. The magnetic proximity effect and lowered symmetry at the interface enhance the spin response of graphene in the alternating electric field of the incident light. The first leads to spin splitting of the linear spectrum of Dirac electrons. The second increases the role of the spin-orbit interaction. The main mechanisms of photogenerated spin polarization have been considered, including spin flip intersubband and interband transitions, and their contribution to the absorption coefficient of graphene. Keywords: Dirac electrons, graphene, electric dipole spin resonance, spin-orbit coupling, spin generation.
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11

Hattori, Kiminori. "Spin Pumping from Rashba Spin–Orbit-Coupled Electron Systems Driven by Electric Dipole Spin Resonance". Journal of the Physical Society of Japan 77, nr 3 (15.03.2008): 034707. http://dx.doi.org/10.1143/jpsj.77.034707.

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12

Chen, Y. F., M. Dobrowolska, J. K. Furdyna i and S. Rodriguez. "Interference of electric-dipole and magnetic-dipole interactions in conduction-electron-spin resonance in InSb". Physical Review B 32, nr 2 (15.07.1985): 890–902. http://dx.doi.org/10.1103/physrevb.32.890.

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13

Hu, Rui-Zi, Rong-Long Ma, Ming Ni, Yuan Zhou, Ning Chu, Wei-Zhu Liao, Zhen-Zhen Kong i in. "Flopping-mode spin qubit in a Si-MOS quantum dot". Applied Physics Letters 122, nr 13 (27.03.2023): 134002. http://dx.doi.org/10.1063/5.0137259.

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Spin qubits based on silicon metal-oxide semiconductor (Si-MOS) quantum dots (QDs) are promising platforms for large-scale quantum computers. To control spin qubits in QDs, electric dipole spin resonance (EDSR) has been most commonly used in recent years. By delocalizing an electron across a double quantum dots charge state, “flopping-mode” EDSR has been realized in Si/SiGe QDs. Here, we demonstrate a flopping-mode spin qubit in a Si-MOS QD via Elzerman single-shot readout. When changing the detuning with a fixed drive power, we achieve s-shape spin resonance frequencies, an order of magnitude improvement in the spin Rabi frequencies, and virtually constant spin dephasing times. Our results offer a route to large-scale spin qubit systems with higher control fidelity in Si-MOS QDs.
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14

Mchedlidze, T., S. Binetti, A. Le Donne, S. Pizzini i M. Suezawa. "Electric-dipole spin-resonance signals related to extended interstitial agglomerates in silicon". Journal of Applied Physics 98, nr 4 (15.08.2005): 043507. http://dx.doi.org/10.1063/1.2001750.

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15

Pasek, W. J., M. P. Nowak i B. Szafran. "Valence band mixing versus higher harmonic generation in electric–dipole spin resonance". Semiconductor Science and Technology 30, nr 5 (27.04.2015): 055017. http://dx.doi.org/10.1088/0268-1242/30/5/055017.

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16

Li, Rui. "Hyperfine interaction mediated electric-dipole spin resonance: the role of frequency modulation". Physica Scripta 91, nr 5 (13.04.2016): 055801. http://dx.doi.org/10.1088/0031-8949/91/5/055801.

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17

Wattenbach, M., C. Kisielowski-Kemmerich, H. Alexander, V. V. Kveder, T. R. McHedlidze i Yu A. Osipyan. "Electric-Dipole Spin Resonance of Dislocations in Plastically Deformed p-Type Silicon". physica status solidi (b) 158, nr 1 (1.03.1990): K49—K53. http://dx.doi.org/10.1002/pssb.2221580150.

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18

Kruk, Danuta, Elzbieta Masiewicz, Anna M. Borkowska, Pawel Rochowski, Pascal H. Fries, Lionel M. Broche i David J. Lurie. "Dynamics of Solid Proteins by Means of Nuclear Magnetic Resonance Relaxometry". Biomolecules 9, nr 11 (25.10.2019): 652. http://dx.doi.org/10.3390/biom9110652.

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1H Nuclear magnetic resonance (NMR) relaxometry was exploited to investigate the dynamics of solid proteins. The relaxation experiments were performed at 37 °C over a broad frequency range, from approximately 10 kHz to 40 MHz. Two relaxation contributions to the overall 1H spin–lattice relaxation were revealed; they were associated with 1H–1H and 1H–14N magnetic dipole–dipole interactions, respectively. The 1H–1H relaxation contribution was interpreted in terms of three dynamical processes occurring on timescales of 10−6 s, 10−7 s, and 10−8 s, respectively. The 1H–14N relaxation contribution shows quadrupole relaxation enhancement effects. A thorough analysis of the data was performed revealing similarities in the protein dynamics, despite their different structures. Among several parameters characterizing the protein dynamics and structure (e.g., electric field gradient tensor at the position of 14N nuclei), the orientation of the 1H–14N dipole–dipole axis, with respect to the principal axis system of the electric field gradient, was determined, showing that, for lysozyme, it was considerably different than for the other proteins. Moreover, the validity range of a closed form expression describing the 1H–14N relaxation contribution was determined by a comparison with a general approach based on the stochastic Liouville equation.
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19

Orlov, Yuri F. "Spin resonance conditions for intrinsic and induced electric dipole moments of a spin-1 particle". Physics Letters A 357, nr 2 (wrzesień 2006): 120–24. http://dx.doi.org/10.1016/j.physleta.2006.04.090.

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20

Gopalan, Sudha, i S. Rodriguez. "Electric-dipole and magnetic-dipole interference in the spin resonance of conduction electrons in Wurtzite semiconductors". Superlattices and Microstructures 1, nr 6 (styczeń 1985): 499–501. http://dx.doi.org/10.1016/s0749-6036(85)80022-7.

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21

Laird, E. A., C. Barthel, E. I. Rashba, C. M. Marcus, M. P. Hanson i A. C. Gossard. "A new mechanism of electric dipole spin resonance: hyperfine coupling in quantum dots". Semiconductor Science and Technology 24, nr 6 (19.05.2009): 064004. http://dx.doi.org/10.1088/0268-1242/24/6/064004.

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22

Yepes, Juan, i Alfonso Zerwekh. "Top partner-resonance interplay in a composite Higgs framework". International Journal of Modern Physics A 33, nr 11 (20.04.2018): 1841008. http://dx.doi.org/10.1142/s0217751x18410087.

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Guided us by the scenario of weak scale naturalness and the possible existence of exotic resonances, we have explored in a [Formula: see text] Composite Higgs setup the interplay among three matter sectors: elementary, top partners and vector resonances. We parametrize it through explicit interactions of spin-1 [Formula: see text]-resonances, coupled to the [Formula: see text]-invariant fermionic currents and tensors presented in this work. Such invariants are built upon the Standard Model fermion sector as well as top partners sourced by the unbroken [Formula: see text]. The mass scales entailed by the top partner and vector resonance sectors will control the low energy effects emerging from our interplaying model. Its phenomenological impact and parameter spaces have been considered via flavor-dijet processes and electric dipole moments bounds. Finally, the strength of the Nambu–Goldstone symmetry breaking and the extra couplings implied by the top partner mass scales are measured in accordance with expected estimations.
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23

Schroth, H., R. App, A. Köpf, K. Lassmann, Hartmut Bracht i Nicolaas Stolwijk. "Electric-Dipole Spin Resonance of Defects Correlated with the Diffusion of ZN Into SI". Materials Science Forum 196-201 (listopad 1995): 1601–6. http://dx.doi.org/10.4028/www.scientific.net/msf.196-201.1601.

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24

Li Rui. "The mechanisms of electric-dipole spin resonance in quasi-one-dimensional semiconductor quantum dot". Acta Physica Sinica 64, nr 16 (2015): 167303. http://dx.doi.org/10.7498/aps.64.167303.

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25

Seifert, Tom S., Stepan Kovarik, Dominik M. Juraschek, Nicola A. Spaldin, Pietro Gambardella i Sebastian Stepanow. "Longitudinal and transverse electron paramagnetic resonance in a scanning tunneling microscope". Science Advances 6, nr 40 (wrzesień 2020): eabc5511. http://dx.doi.org/10.1126/sciadv.abc5511.

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Electron paramagnetic resonance (EPR) spectroscopy is widely used to characterize paramagnetic complexes. Recently, EPR combined with scanning tunneling microscopy (STM) achieved single-spin sensitivity with sub-angstrom spatial resolution. The excitation mechanism of EPR in STM, however, is broadly debated, raising concerns about widespread application of this technique. We present an extensive experimental study and modeling of EPR-STM of Fe and hydrogenated Ti atoms on a MgO surface. Our results support a piezoelectric coupling mechanism, in which the EPR species oscillate adiabatically in the inhomogeneous magnetic field of the STM tip. An analysis based on Bloch equations combined with atomic-multiplet calculations identifies different EPR driving forces. Specifically, transverse magnetic field gradients drive the spin-1/2 hydrogenated Ti, whereas longitudinal magnetic field gradients drive the spin-2 Fe. Also, our results highlight the potential of piezoelectric coupling to induce electric dipole moments, thereby broadening the scope of EPR-STM to nonpolar species and nonlinear excitation schemes.
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26

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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27

Jagannath, C., i R. L. Aggarwal. "Stress-induced electric-dipole-allowed far-infrared generation at the spin-resonance frequency in InSb". Physical Review B 32, nr 4 (15.08.1985): 2243–47. http://dx.doi.org/10.1103/physrevb.32.2243.

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28

Tsoneva, Nadia. "Pygmy and giant resonances: connecting the nuclear structure to stellar astrophysics". EPJ Web of Conferences 194 (2018): 04001. http://dx.doi.org/10.1051/epjconf/201819404001.

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Systematic theoretical investigations of dipole response in neutron-rich nuclei of importance for day-one photonuclear experiments at ELI-NP are presented. The calculations are performed in advanced mi- croscopic theory based on energy-density functional and three-phonon quasiparticle-phonon model. The model basis accounts for a large range of nuclear excitations with different spin and parity. In the focus of the studies are electric and magnetic dipole modes with energies up to 25 MeV. Of special interest are pygmy dipole and giant dipole resonances. The impact of different low-energy excitations and in particular of the PDR on radia- tive neutron-capture reaction cross sections in nuclei of key importance for nucleosynthesis is investigated.The obtained results are compared to available experimental data.
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29

Chernyshov, N. N., N. I. Slipchenko, A. V. Belousov i M. A. F. Alkhawaldeh. "Photovoltaic effect in optical transitions for ultraquantum limit between spin areas of Landau levels". Radiotekhnika, nr 194 (26.09.2018): 112–18. http://dx.doi.org/10.30837/rt.2018.3.194.15.

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The article is devoted to the investigation of the photovoltaic effect in GaAs under optical transitions between the spin sub-bands of the Landau levels for the ultra quantum limit. The geometry is considered, when the polarization is perpendicular, and the current is directed along the magnetic field. The effect is due to the cubic terms in the Hamiltonian that exist due to the absence of an inversion center. The dependence of the current on the magnetic field has a resonance nature. Such an effect is associated with resonance in the intermediate state and interference of the second-order transition amplitudes with respect to relativistic contributions to the Hamiltonian. The aim of the work is a theoretical and experimental study of the photovoltaic effect for spin resonance. The practical value and scientific novelty lies in the study of the photovoltaic effect at spin resonance. Since a weakly absorbing medium is considered, an increase in the photovoltaic effect is observed as a result of the divergence of the mean square electric field modulus. The practical significance of the results lies in the development of a methodology for studying band parameters, and the terms in the Hamiltonian can lead to electro dipole transitions and photocurrents.
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30

Chen, Tong-Zhen, Yu-Qian He, Zhen-Yu Shi, Le Ai, Tao Shui, Wen-Xing Yang i Zia uddin. "Coherent control of the photonic spin Hall effect by Er3+ ion concentration in an Er3+-doped YAG crystal". Optical Materials Express 13, nr 10 (28.09.2023): 2964. http://dx.doi.org/10.1364/ome.501436.

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We theoretically investigate the effect of doped Er3+ ion concentration on the spin Hall effect (SHE) of light reflected from a Kretschmann-Raether (K-R) structure. In such a structure, an Er3+-doped yttrium aluminum garnet (YAG) crystal acts as the substrate. The excitation of surface plasmon resonance(SPR) leads to the enhancement of the spin splitting of the reflected beam in the resonance reflection dip. Due to the variation of electric dipole moment and energy level lifetime induced by Er3+ ion concentration, the spin-dependent transverse shift is sensitively dependent upon Er3+ ion concentration. Furthermore, under different concentrations of Er3+ ion, the intensity and detuning of the control field have different effects on the magnitude, sign and position of the transverse shift. More importantly, the photonic SHE can be significantly enhanced via choosing the suitable values of the control intensity and detuning at 15% Er3+ ion concentration. Therefore, our scheme may provide a basis for selecting suitable Er3+ ion concentration to enhance the SHE of light in future integrated systems.
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31

Alquraishi, M., V. E. Lembessis, A. Lyras i O. M. Aldossary. "Optical dipole potential energy of a two-level atom interacting with a tightly focused truncated optical Bessel beam". Laser Physics 33, nr 12 (25.10.2023): 125501. http://dx.doi.org/10.1088/1555-6611/ad00a7.

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Abstract Truncated optical Bessel (TOB) beams are an orthonormal set of optical vortex beams that possess orbital angular momentum (OAM). It is characterized by a significant longitudinal electric field component at the sub-wavelength scales. The photons of a circularly polarized TOB beam also carry spin angular momentum (SAM) and can interact with a two-level atom, in the far-off resonance regime, giving rise to an optical dipole potential energy that involves a spin–orbit term that stems from the inclusion of the longitudinal field component. When a two-level atom is simultaneously irradiated by two TOB beams, the optical dipole potential energy, in some special cases, is entirely dependent on the OAM–SAM coupling. We explore the cold-atom trapping options enabled by the use of TOB beams, either single ones or combinations thereof. We put emphasis on case in which the OAM–SAM coupling is the dominant contribution. The similarities and differences between the results obtained for the TOB beams and those for the Laguerre–Gaussian beams are also discussed.
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32

Verkhovskii, S. V., B. Z. Malkin, A. Trokiner, A. Yakubovskii, E. Haller, A. Ananyev, A. Gerashenko i in. "Quadrupole Effects on 73Ge NMR Spectra in Isotopically Controlled Ge Single Crystals". Zeitschrift für Naturforschung A 55, nr 1-2 (1.02.2000): 105–10. http://dx.doi.org/10.1515/zna-2000-1-218.

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NMR spectra of 73Ge (nuclear spin I = 9/2) in perfect single crystals of germanium with different isotopic content were measured at 80, 300, and 450 K. The observed specific line shapes gave evidence of the isotopic disorder, in particular, abnormal broadening of the spectrum was found for the magnetic field directed along the [111] axis. Local lattice deformations in the germanium crystal lattice due to "isotopic disorder" were calculated in the framework of the adiabatic bond charge model. The results were applied to study random non-cubic crystal field interactions with the nuclear quadrupole moments and corresponding effects on NMR spectra. The simulated second moment of the resonance frequency distributions caused by the magnetic dipole-dipole and electric quadrupole interactions are used to analyze the lineshapes, theoretical predictions being in a qualitative agreement with the experimental data.
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33

Mchedlidze, T. R., V. V. Kveder, J. Jablonski i K. Sumino. "Electric-dipole spin-resonance study on extended defects in Czochralski-grown silicon developed by thermal treatment". Physical Review B 50, nr 3 (15.07.1994): 1511–18. http://dx.doi.org/10.1103/physrevb.50.1511.

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34

Chiu, Ying-Nan, i Lue-Yung Chow Chiu. "An alternative mechanism for spin-forbidden photo-ionization of diatomic molecules and its rotation–electronic selection rules". Canadian Journal of Physics 68, nr 2 (1.02.1990): 177–83. http://dx.doi.org/10.1139/p90-025.

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The spin-forbidden photo-ionization of diatomic molecules is proposed. Spin orbit interaction is invoked resulting in the correction and mixing of the wave functions of different multiplicities. The rotation–electronic selection rules given, but not proven, by Dixit and McKoy for Hund's case a based on the conventional mechanism of electric dipole transition (see Chem. Phys. Lett. 128, 49 (1986) are rederived and expressed in a different format. This new format permits the generalization of the selection rules to other photo-ionization transitions caused by the magnetic dipole, the electric quadrupole, and the two- and three-photon operators. These selection rules, which are for transitions from one specific rotational level of a given Kronig reflection symmetry to another, will help understand rotational branching and the dynamics of interaction in the excited state. They will also help in the selective preparation of well-defined rovibronic states in resonant-enhanced multi-photon ionization processes.
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35

Buckingham, A. David. "Chiral discrimination in NMR spectroscopy". Quarterly Reviews of Biophysics 48, nr 4 (16.07.2015): 421–23. http://dx.doi.org/10.1017/s0033583515000074.

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AbstractNuclear magnetic resonance is the most important form of molecular spectroscopy in chemistry and biochemistry but it is normally blind to chirality. It was predicted in 2004 that precessing nuclear spins in chiral molecules in a liquid in a strong magnetic field induce a rotating electric polarization that is of opposite sign for enantiomers. This polarization arises from the distortion of the electronic structure by the nuclear magnetic moment in the presence of the strong magnetic field and is equivalent to the linear effect of an electric field on the nuclear shielding tensor. The polarization is strongly enhanced in dipolar molecules through the partial orientation of the permanent dipole through the antisymmetric part of the nuclear magnetic shielding tensor. Alternatively, an applied electric field will induce a chirally sensitive magnetization perpendicular to the field and to the nuclear spin. Progress towards the experimental realization of chiral discrimination by NMR is assessed.
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36

Michaluk, E., J. Błoniarz, M. Pabich, Z. Wilamowski i A. Mycielski. "Electric Dipole and Current Induced Spin Resonances of Shallow Donor in ZnO". Acta Physica Polonica A 110, nr 2 (sierpień 2006): 263–70. http://dx.doi.org/10.12693/aphyspola.110.263.

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37

Nakamura, Shungo, Haruki Kiyama i Akira Oiwa. "Micromagnet design for addressable fast spin manipulations in a 2 × 2 quantum dot array". Journal of Applied Physics 132, nr 22 (14.12.2022): 224301. http://dx.doi.org/10.1063/5.0088840.

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The scaling up of semiconductor quantum dots to two-dimensional arrays is attracting considerable interest for use in large-scale spin-based quantum computation. One of the fundamental technologies to be realized in the two-dimensional arrays of quantum dots is the coherent manipulations of individual electron spins. In this work, we report on a micromagnet design that generates stray magnetic fields that can be used for spin manipulations via electric dipole spin resonance in a 2 × 2 quantum dot array. We consider a micromagnet with lower symmetry than that typically used in the case of linear dot arrays and optimize its dimensions to produce a maximum stray field gradient while maintaining Zeeman splitting differences sufficiently large among the four dots to permit qubit addressability. The optimized field gradient is around 60% smaller than that used in linear dot arrays, but it is still large enough for spin manipulation experiments. Our result represents an important step toward the experimental realization of spin-qubit operations in two-dimensional arrays of quantum dots.
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38

Hu, Guangchong, Rose L. Ahlefeldt, Gabriele G. de Boo, Alexey Lyasota, Brett C. Johnson, Jeffrey C. McCallum, Matthew J. Sellars, Chunming Yin i Sven Rogge. "Single site optical spectroscopy of coupled Er3+ ion pairs in silicon". Quantum Science and Technology 7, nr 2 (9.03.2022): 025019. http://dx.doi.org/10.1088/2058-9565/ac56c7.

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Abstract Individual optical emitters coupled via coherent interactions are attractive qubits for quantum communications applications. Here, we present the first study of single pairs of interacting rare earth ions and determine the interactions between ions in the pair with high resolution. We identify two examples of Er3+ pair sites in Er implanted Si and characterise the interactions using optical Zeeman spectroscopy. We identify one pair as two Er3+ ions in sites of at least C 2 symmetry coupled via a large, 200 GHz, Ising-like spin interaction in both optical ground and excited states. The high measurement resolution allows non-Ising contributions to the interaction of < 1 % to be observed, attributed to site distortion. By bringing two optical transitions into resonance with a magnetic field, we observe a 0.8 GHz optical interaction of unusual magnetic-dipole/electric-dipole character with strong polarization selection rules. We discuss the use of this type of strongly coupled, field-tunable rare earth pair system for quantum processing.
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39

Kveder, Vitaly V., Takashi Sekiguchi i Koji Sumino. "Electronic States Associated with Straight Dislocations in P-Type SiliconStudied by Means of Electric-Dipole Spin Resonance". Materials Science Forum 196-201 (listopad 1995): 1189–94. http://dx.doi.org/10.4028/www.scientific.net/msf.196-201.1189.

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40

Rebane, Y. T., i Y. G. Shreter. "Electric-Dipole Spin Resonance of Electrons on 60°-Dislocations in Plastically Deformed nGe and nSi". Physica Status Solidi (a) 137, nr 2 (16.06.1993): 603–10. http://dx.doi.org/10.1002/pssa.2211370230.

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41

Jessen, P. S., D. L. Haycock, G. Klose, G. A. Smith, I. H. Deutsch i G. K. Brennen. "Quantum control and information processing in optical lattices". Quantum Information and Computation 1, Special (grudzień 2001): 20–32. http://dx.doi.org/10.26421/qic1.s-5.

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Neutral atoms offer a promising platform for single- and many-body quantum control, as required for quantum information processing. This includes excellent isolation from the decohering influence of the environment, and the existence of well developed techniques for atom trapping and coherent manipulation. We present a review of our work to implement quantum control and measurement for ultra-cold atoms in far-off-resonance optical lattice traps. In recent experiments we have demonstrated coherent behavior of mesoscopic atomic spinor wavepackets in optical double-well potentials, and carried out quantum state tomography to reconstruct the full density matrix for the atomic spin degrees of freedom. This model system shares a number of important features with proposals to implement quantum logic and quantum computing in optical lattices. We present a theoretical analysis of a protocol for universal quantum logic via single qubit operations and an entangling gate based on electric dipole-dipole interactions. Detailed calculations including the full atomic hyperfine structure suggests that high-fidelity quantum gates are possible under realistic experimental conditions.
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42

Kobori, Hiromi, Akira Sugio, Nobuteru Tsubouchi, Kenichi Fujii, Tyuzi Ohyama i Ko Sugihara. "Linewidth Study of Electric Dipole Induced Spin Resonance in Uniaxially Stressed n-InSb in Far Infrared Regions: Experimental". Journal of the Physical Society of Japan 69, nr 7 (15.07.2000): 2315–23. http://dx.doi.org/10.1143/jpsj.69.2315.

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43

Sugihara, Ko, Hiromi Kobori, Nobuteru Tsubouchi, Akira Sugio, Kenichi Fujii i Tyuzi Ohyama. "Linewidth Study of Electric Dipole induced Spin Resonance in Uniaxially Stressed n-InSb for Far-Infrared Region: Theoretical". Journal of the Physical Society of Japan 69, nr 9 (wrzesień 2000): 3084–89. http://dx.doi.org/10.1143/jpsj.69.3084.

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44

Черненко, А. В. "О доминирующем механизме безызлучательного возбуждения ионов марганца в II-VI полумагнитных полупроводниках". Физика и техника полупроводников 54, nr 4 (2020): 363. http://dx.doi.org/10.21883/ftp.2020.04.49141.9273.

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Doping of group II-VI semiconductors and low-dimensional structures based on them with manganese leads to effective quenching of electro-and photoluminescence provided that the electron excitation energy of the crystal exceeds the energy of the intracenter transition of Mn2+ EMn и 2.1 eV. Quenching involves efficient energy transfer from the photoexcited crystal to Mn2 + ions. There are three possible mechanisms of this non-radiative energy transfer: dipole-dipole, exchange and related mechanism associated with sp-d mixing. Although the dipole-dipole mechanism is thought to be ineffective due to the forbidden intracenter transition in Mn2+, and the spin-dependent exchange mechanism is dominant, not all experimental facts accumulated to date supports this conclusion. The article discusses two experimental approaches to identify the dominant mechanism of energy transfer to Mn2 + ions and to evaluate the partial contributions of the mechanisms. One of these approaches is related to optically detectable magnetic resonance at single diluted magnetic semiconductor quantum dots (QD), the second - to plasmon amplification of energy transfer to Mn2 + ions by means of dipole-dipole interaction.
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45

León-González, José C., Rafael G. Toscano-Negrette, A. L. Morales, J. A. Vinasco, M. B. Yücel, H. Sari, E. Kasapoglu i in. "Spin–Orbit and Zeeman Effects on the Electronic Properties of Single Quantum Rings: Applied Magnetic Field and Topological Defects". Nanomaterials 13, nr 9 (25.04.2023): 1461. http://dx.doi.org/10.3390/nano13091461.

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Within the framework of effective mass theory, we investigate the effects of spin–orbit interaction (SOI) and Zeeman splitting on the electronic properties of an electron confined in GaAs single quantum rings. Energies and envelope wavefunctions in the system are determined by solving the Schrödinger equation via the finite element method. First, we consider an inversely quadratic model potential to describe electron confining profiles in a single quantum ring. The study also analyzes the influence of applied electric and magnetic fields. Solutions for eigenstates are then used to evaluate the linear inter-state light absorption coefficient through the corresponding resonant transition energies and electric dipole matrix moment elements, assuming circular polarization for the incident radiation. Results show that both SOI effects and Zeeman splitting reduce the absorption intensity for the considered transitions compared to the case when these interactions are absent. In addition, the magnitude and position of the resonant peaks have non-monotonic behavior with external magnetic fields. Secondly, we investigate the electronic and optical properties of the electron confined in the quantum ring with a topological defect in the structure; the results show that the crossings in the energy curves as a function of the magnetic field are eliminated, and, therefore, an improvement in transition energies occurs. In addition, the dipole matrix moments present a non-oscillatory behavior compared to the case when a topological defect is not considered.
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46

Kveder, V., T. Sekiguchi i K. Sumino. "Electronic states associated with dislocations inp-type silicon studied by means of electric-dipole spin resonance and deep-level transient spectroscopy". Physical Review B 51, nr 23 (15.06.1995): 16721–27. http://dx.doi.org/10.1103/physrevb.51.16721.

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47

Sauer, B. E., Jun Wang i E. A. Hinds. "Laser‐rf double resonance spectroscopy of 174YbF in the X 2Σ+ state: Spin‐rotation, hyperfine interactions, and the electric dipole moment". Journal of Chemical Physics 105, nr 17 (listopad 1996): 7412–20. http://dx.doi.org/10.1063/1.472569.

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48

Wu, Jian-Dong, Zhi Cheng, Xiang-Yu Ye, Zhao-Kai Li, Peng-Fei Wang, Chang-Lin Tian i Hong-Wei Cheng. "Coherent electrical control of a single electron spin in diamond nitrogen-vacancy centers". Acta Physica Sinica 71, nr 11 (2022): 1. http://dx.doi.org/10.7498/aps.70.20220410.

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The nitrogen-vacancy (NV) color center quantum system in diamond has shown great application potential in the fields of solid-state quantum computing and quantum precision measurement because of its unique advantages such as single-spin addressing and manipulation and long quantum coherence time at room temperature. The precise manipulation technology of single spin is particularly important for the development of the application of NV center. The common spin manipulation methods used in NV center quantum system are to drive and manipulate the electron spin by resonant alternating magnetic field. In recent years, the electrical control of quantum spin has attracted extensive attention. In this paper, the use of alternating electric field to control the electron spin of NV center has been studied. The alternating electric field generated by the electrode successfully drives the Rabi oscillation of the NV center spin between the <inline-formula><tex-math id="M4">\begin{document}$\Delta m_s=\pm2$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="11-20220410_M4.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="11-20220410_M4.png"/></alternatives></inline-formula> magnetic-dipole forbidden energy levels of <inline-formula><tex-math id="M5">\begin{document}$|m_s=-1\rangle$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="11-20220410_M5.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="11-20220410_M5.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M6">\begin{document}$|m_s=+1\rangle$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="11-20220410_M6.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="11-20220410_M6.png"/></alternatives></inline-formula>. Further studies show that the frequency of the electrically driven Rabi oscillation is controlled by the power of the driven electric field and independent of the resonant frequency of the electric field. The combination of spin electric control and magnetic control technology can realize the full manipulation of the direct transition between the three spin energy levels of NV center, thus promoting the development of the research and applications of NV quantum system in the fields of quantum simulation, quantum computing, precision measurement of electromagnetic field and so on.
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49

Melnikov, A., A. Aksentyev, Y. Senichev i S. Kolokolchikov. "Studies of the spin coherence time of protons at COSY". Journal of Physics: Conference Series 2687, nr 5 (1.01.2024): 052025. http://dx.doi.org/10.1088/1742-6596/2687/5/052025.

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Abstract The search for the Electric Dipole Moments (EDM) of charged particles in storage rings necessitates polarized beams with long Spin Coherence Time (SCT) of the circulating beam. The SCT is the time during which the RMS spread of the orientation of spins of all particles in the bunch reaches one radian. A long SCT is needed to observe the coherent effect of a polarization build-up induced by the EDM. For deuterons the SCT of 1000 s has been achieved at the COoler SYnchrotron COSY (Jülich, Germany). Accomplishing such long SCT for protons is far more challenging due to their higher anomalous magnetic moment, but essential for the planned EDM experiments. It has been shown that for protons the SCT is strongly influenced by nearby intrinsic and integer spin resonances. The strengths of the latter have been calculated for a typical optics setting of COSY and the overall influence on the SCT was predicted. In addition, the efficiency of proton spin flipping with an RF solenoid from initially vertical direction into the ring plane is also investigated.
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50

Kochelap, V. A., i A. E. Belyaev. "To 95-th birthday of Professor E.I. Rashba (looking back ones again)". Semiconductor Physics, Quantum Electronics and Optoelectronics 25, nr 3 (6.10.2022): 235–39. http://dx.doi.org/10.15407/spqeo25.03.235.

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The theory of spin-orbit interaction, developed by E.I. Rashba more than 30 years ago, stimulated the rapid development of a new discipline – spintronics – the physics of processes and devices based on the control of spins. The paper summarizes achievements of Prof. Rashba in the early stage of his scientific researches, particularly those, which were performed in Ukraine. Among them, prediction of electric dipole spin resonance (EDSR), phase transitions in spin-orbit coupled systems driven by change of the Fermi surface topology, giant oscillator strength of impurity excitons, and coexistence of free and self-trapped excitons. Solid state physics is the basis of contemporary electronics and optoelectronics. Various electronic, optical, acoustical and other effects and processes in solid define performances of modern solid state devices. Multitude of groups and thousands researchers are involved in discovering, study and using relevant new phenomena. Among them, Professor Emmanuel Rashba with his outstanding results in physics of crystals is seen (rises) as a profound personality. His contribution in almost all branches of solid state physics cannot be exaggerated, some of his results have found important applications. Prof. E.I. Rashba is known as one of the leading theorists in Ukraine, in Soviet Union, and he continued the successful career in United States. Although many years have already passed, scientific community in Ukraine remembers Prof. E.I. Rashba and thankfully appreciates his impact to formation of condensed matter researches in our country. This short text is devoted to Prof. E.I. Rashba and is written on the occasion of his birthday.
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