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Zeitschriftenartikel zum Thema „Quantum magnetisms“

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Veröffentlicht am 23. November 2024

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1

Stewart, A. M. „Gauge Invariant Magnetism“. Australian Journal of Physics 50, Nr. 6 (1997): 1061. http://dx.doi.org/10.1071/p97024.

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An introduction is given to features of gauge invariance in classical and quantum mechanics that are of importance for magnetism in condensed matter systems. A version of quantum mechanics is described in which full electromagnetic gauge arbitrariness is displayed explicitly at every stage. The division of orbital magnetism into paramagnetism and diamagnetism is examined and it is shown that only by treating both of these on an equal footing can a gauge invariant treatment of magnetism be constructed.

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2

Osborne, Ian S. „Cooperative quantum magnetism“. Science 361, Nr. 6404 (23.08.2018): 763.14–765. http://dx.doi.org/10.1126/science.361.6404.763-n.

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3

Freeman, Arthur J., und Kohji Nakamura. „Computational quantum magnetism: Role of noncollinear magnetism“. Journal of Magnetism and Magnetic Materials 321, Nr. 7 (April 2009): 894–98. http://dx.doi.org/10.1016/j.jmmm.2008.11.107.

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4

Slot, M. R., Y. Maximenko, P. M. Haney, S. Kim, D. T. Walkup, E. Strelcov, Son T. Le et al. „A quantum ruler for orbital magnetism in moiré quantum matter“. Science 382, Nr. 6666 (06.10.2023): 81–87. http://dx.doi.org/10.1126/science.adf2040.

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For almost a century, magnetic oscillations have been a powerful “quantum ruler” for measuring Fermi surface topology. In this study, we used Landau-level spectroscopy to unravel the energy-resolved valley-contrasting orbital magnetism and large orbital magnetic susceptibility that contribute to the energies of Landau levels of twisted double-bilayer graphene. These orbital magnetism effects led to substantial deviations from the standard Onsager relation, which manifested as a breakdown in scaling of Landau-level orbits. These substantial magnetic responses emerged from the nontrivial quantum geometry of the electronic structure and the large length scale of the moiré lattice potential. Going beyond traditional measurements, Landau-level spectroscopy performed with a scanning tunneling microscope offers a complete quantum ruler that resolves the full energy dependence of orbital magnetic properties in moiré quantum matter.

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5

Sachdev, Subir. „Quantum magnetism and criticality“. Nature Physics 4, Nr. 3 (März 2008): 173–85. http://dx.doi.org/10.1038/nphys894.

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6

Inosov, D. S. „Quantum magnetism in minerals“. Advances in Physics 67, Nr. 3 (03.07.2018): 149–252. http://dx.doi.org/10.1080/00018732.2018.1571986.

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7

Blackburn, Elizabeth. „Magnetism, superconductors, quantum systems“. Neutron News 24, Nr. 4 (Oktober 2013): 6–7. http://dx.doi.org/10.1080/10448632.2013.831644.

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8

Castilla, G., S. Chakravarty und V. J. Emery. „Quantum Magnetism of CuGeO3“. Physical Review Letters 75, Nr. 9 (28.08.1995): 1823–26. http://dx.doi.org/10.1103/physrevlett.75.1823.

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9

KUZEMSKY, A. L. „QUANTUM PROTECTORATE AND MICROSCOPIC MODELS OF MAGNETISM“. International Journal of Modern Physics B 16, Nr. 05 (20.02.2002): 803–23. http://dx.doi.org/10.1142/s0217979202010002.

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Some physical implications involved in a new concept, termed the "quantum protectorate" (QP), are developed and discussed. This is done by considering the idea of quantum protectorate in the context of quantum theory of magnetism. It is suggested that the difficulties in the formulation of quantum theory of magnetism at the microscopic level, that are related to the choice of relevant models, can be understood better in the light of the QP concept. We argue that the difficulties in the formulation of adequate microscopic models of electron and magnetic properties of materials are intimately related to dual, itinerant and localized behaviour of electrons. We formulate a criterion of what basic picture describes best this dual behaviour. The main suggestion is that quasi-particle excitation spectra might provide distinctive signatures and good criteria for the appropriate choice of the relevant model.

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10

Georgii, Robert, und Klaus-Dieter Liss. „Quantum Beams for New Aspects in Magnetic Materials and Magnetism“. Quantum Beam Science 3, Nr. 4 (25.11.2019): 22. http://dx.doi.org/10.3390/qubs3040022.

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11

De Poortere, E. P., E. Tutuc, R. Pillarisetty, S. Melinte und M. Shayegan. „Magnetism and pseudo-magnetism in quantum Hall systems“. Physica E: Low-dimensional Systems and Nanostructures 20, Nr. 1-2 (Dezember 2003): 123–32. http://dx.doi.org/10.1016/j.physe.2003.09.029.

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12

Rabelo, Renato, Salah-Eddine Stiriba, Danielle Cangussu, Cynthia L. M. Pereira, Nicolás Moliner, Rafael Ruiz-García, Joan Cano, Juan Faus, Yves Journaux und Miguel Julve. „When Molecular Magnetism Meets Supramolecular Chemistry: Multifunctional and Multiresponsive Dicopper(II) Metallacyclophanes as Proof-of-Concept for Single-Molecule Spintronics and Quantum Computing Technologies?“ Magnetochemistry 6, Nr. 4 (04.12.2020): 69. http://dx.doi.org/10.3390/magnetochemistry6040069.

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Molecular magnetism has made a long journey, from the fundamental studies on through-ligand electron exchange magnetic interactions in dinuclear metal complexes with extended organic bridges to the more recent exploration of their electron spin transport and quantum coherence properties. Such a field has witnessed a renaissance of dinuclear metallacyclic systems as new experimental and theoretical models for single-molecule spintronics and quantum computing, due to the intercrossing between molecular magnetism and metallosupramolecular chemistry. The present review reports a state-of-the-art overview as well as future perspectives on the use of oxamato-based dicopper(II) metallacyclophanes as promising candidates to make multifunctional and multiresponsive, single-molecule magnetic (nano)devices for the physical implementation of quantum information processing (QIP). They incorporate molecular magnetic couplers, transformers, and wires, controlling and facilitating the spin communication, as well as molecular magnetic rectifiers, transistors, and switches, exhibiting a bistable (ON/OFF) spin behavior under external stimuli (chemical, electronic, or photonic). Special focus is placed on the extensive research work done by Professor Francesc Lloret, an outstanding chemist, excellent teacher, best friend, and colleague, in recognition of his invaluable contributions to molecular magnetism on the occasion of his 65th birthday.

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13

Zhou, Yungang, Geng Cheng und Jing Li. „Coexistence of Co doping and strain on arsenene and antimonene: tunable magnetism and half-metallic behavior“. RSC Advances 8, Nr. 3 (2018): 1320–27. http://dx.doi.org/10.1039/c7ra11163k.

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14

Vallury, Harish J., Michael A. Jones, Gregory A. L. White, Floyd M. Creevey, Charles D. Hill und Lloyd C. L. Hollenberg. „Noise-robust ground state energy estimates from deep quantum circuits“. Quantum 7 (11.09.2023): 1109. http://dx.doi.org/10.22331/q-2023-09-11-1109.

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In the lead up to fault tolerance, the utility of quantum computing will be determined by how adequately the effects of noise can be circumvented in quantum algorithms. Hybrid quantum-classical algorithms such as the variational quantum eigensolver (VQE) have been designed for the short-term regime. However, as problems scale, VQE results are generally scrambled by noise on present-day hardware. While error mitigation techniques alleviate these issues to some extent, there is a pressing need to develop algorithmic approaches with higher robustness to noise. Here, we explore the robustness properties of the recently introduced quantum computed moments (QCM) approach to ground state energy problems, and show through an analytic example how the underlying energy estimate explicitly filters out incoherent noise. Motivated by this observation, we implement QCM for a model of quantum magnetism on IBM Quantum hardware to examine the noise-filtering effect with increasing circuit depth. We find that QCM maintains a remarkably high degree of error robustness where VQE completely fails. On instances of the quantum magnetism model up to 20 qubits for ultra-deep trial state circuits of up to 500 CNOTs, QCM is still able to extract reasonable energy estimates. The observation is bolstered by an extensive set of experimental results. To match these results, VQE would need hardware improvement by some 2 orders of magnitude on error rates.

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Jadaun, Priyamvada, und Bart Soreé. „Review of Orbital Magnetism in Graphene-Based Moiré Materials“. Magnetism 3, Nr. 3 (28.08.2023): 245–58. http://dx.doi.org/10.3390/magnetism3030019.

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Recent years have seen the emergence of moiré materials as an attractive platform for observing a host of novel correlated and topological phenomena. Moiré heterostructures are generated when layers of van der Waals materials are stacked such that consecutive layers are slightly mismatched in their lattice orientation or unit cell size. This slight lattice mismatch gives rise to a long-wavelength moiré pattern that modulates the electronic structure and leads to novel physics. The moiré superlattice results in flat superlattice bands, electron–electron interactions and non-trivial topology that have led to the observation of superconductivity, the quantum anomalous Hall effect and orbital magnetization, among other interesting properties. This review focuses on the experimental observation and theoretical analysis of orbital magnetism in moiré materials. These systems are novel in their ability to host magnetism that is dominated by the orbital magnetic moment of Bloch electrons. This orbital magnetic moment is easily tunable using external electric fields and carrier concentration since it originates in the quantum anomalous Hall effect. As a result, the orbital magnetism found in moiré superlattices can be highly attractive for a wide array of applications including spintronics, ultra-low-power magnetic memories, spin-based neuromorphic computing and quantum information technology.

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Persky, Eylon, Ilya Sochnikov und Beena Kalisky. „Studying Quantum Materials with Scanning SQUID Microscopy“. Annual Review of Condensed Matter Physics 13, Nr. 1 (10.03.2022): 385–405. http://dx.doi.org/10.1146/annurev-conmatphys-031620-104226.

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Electronic correlations give rise to fascinating macroscopic phenomena such as superconductivity, magnetism, and topological phases of matter. Although these phenomena manifest themselves macroscopically, fully understanding the underlying microscopic mechanisms often requires probing on multiple length scales. Spatial modulations on the mesoscopic scale are especially challenging to probe, owing to the limited range of suitable experimental techniques. Here, we review recent progress in scanning superconducting quantum interference device (SQUID) microscopy. We demonstrate how scanning SQUID combines unmatched magnetic field sensitivity and highly versatile designs, by surveying discoveries in unconventional superconductivity, exotic magnetism, topological states, and more. Finally, we discuss how SQUID microscopy can be further developed to answer the increasing demand for imaging new quantum materials.

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17

Mejía-López, J., Ana Mejía-López und J. Mazo-Zuluaga. „Uniaxial magnetic anisotropy energy of bimetallic Co–Ni clusters from a first-principles perspective“. Physical Chemistry Chemical Physics 20, Nr. 24 (2018): 16528–39. http://dx.doi.org/10.1039/c8cp01372a.

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18

Liu, Liang, Zezhou Lin, Jifan Hu und Xi Zhang. „Full quantum search for high Tc two-dimensional van der Waals ferromagnetic semiconductors“. Nanoscale 13, Nr. 17 (2021): 8137–45. http://dx.doi.org/10.1039/d0nr08687h.

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19

Schmaljohann, H., M. Erhard, J. Kronjägert, M. Kottke, S. Van Staa, J. J. Arlt, K. Bongs und K. Sengstock. „Magnetism in ultracold quantum gases“. Journal of Modern Optics 51, Nr. 12 (August 2004): 1829–41. http://dx.doi.org/10.1080/09500340408232494.

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20

Spielman, Ian B. „A route to quantum magnetism“. Nature 472, Nr. 7343 (April 2011): 301–2. http://dx.doi.org/10.1038/nature10101.

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21

Samson, J. H. „Quantum effects in itinerant magnetism“. Journal of Magnetism and Magnetic Materials 54-57 (Februar 1986): 983–84. http://dx.doi.org/10.1016/0304-8853(86)90344-6.

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22

Luo, Yu-Chen, und Xiao-Peng Li. „Quantum simulation of interacting fermions“. Acta Physica Sinica 71, Nr. 22 (2022): 226701. http://dx.doi.org/10.7498/aps.71.20221756.

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Fermions are basic building blocks in the standard model. Interactions among these elementary particles determine how they assemble and consequently form various states of matter in our nature. Simulating fermionic degrees of freedom is also a central problem in condensed matter physics and quantum chemistry, which is crucial to understanding high-temperature superconductivity, quantum magnetism and molecular structure and functionality. However, simulating interacting fermions by classical computing generically face the minus sign problem, encountering the exponential computation complexity. Ultracold atoms provide an ideal experimental platform for quantum simulation of interacting fermions. This highly-controllable system enables the realizing of nontrivial fermionic models, by which the physical properties of the models can be obtained by measurements in experiment. This deepens our understanding of related physical mechanisms and help determine the key parameters. In recent years, there have been versatile experimental studies on quantum ground state physics, finite temperature thermal equilibrium, and quantum many-body dynamics, in fermionic quantum simulation systems. Quantum simulation offers an access to the physical problems that are intractable on the classical computer, including studying macroscopic quantum phenomena and microscopic physical mechanisms, which demonstrates the quantum advantages of controllable quantum systems. This paper briefly introduces the model of interacting fermions describing the quantum states of matter in such a system. Then we discuss various states of matter, which can arise in interacting fermionic quantum systems, including Cooper pair superfluids and density-wave orders. These exotic quantum states play important roles in describing high-temperature superconductivity and quantum magnetism, but their simulations on the classical computers have exponentially computational cost. Related researches on quantum simulation of interacting fermions in determining the phase diagrams and equation of states reflect the quantum advantage of such systems.

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23

Qiu, Gang, Hung-Yu Yang, Su Kong Chong, Yang Cheng, Lixuan Tai und Kang L. Wang. „Manipulating Topological Phases in Magnetic Topological Insulators“. Nanomaterials 13, Nr. 19 (27.09.2023): 2655. http://dx.doi.org/10.3390/nano13192655.

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Magnetic topological insulators (MTIs) are a group of materials that feature topological band structures with concurrent magnetism, which can offer new opportunities for technological advancements in various applications, such as spintronics and quantum computing. The combination of topology and magnetism introduces a rich spectrum of topological phases in MTIs, which can be controllably manipulated by tuning material parameters such as doping profiles, interfacial proximity effect, or external conditions such as pressure and electric field. In this paper, we first review the mainstream MTI material platforms where the quantum anomalous Hall effect can be achieved, along with other exotic topological phases in MTIs. We then focus on highlighting recent developments in modulating topological properties in MTI with finite-size limit, pressure, electric field, and magnetic proximity effect. The manipulation of topological phases in MTIs provides an exciting avenue for advancing both fundamental research and practical applications. As this field continues to develop, further investigations into the interplay between topology and magnetism in MTIs will undoubtedly pave the way for innovative breakthroughs in the fundamental understanding of topological physics as well as practical applications.

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24

Gulacsi, M. „Magnetism in rare-earth alloys“. International Journal of Modern Physics B 28, Nr. 25 (09.09.2014): 1430016. http://dx.doi.org/10.1142/s0217979214300163.

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Low dimensional rare-earth alloys reveal a rich phase diagram which always incorporate a ferromagnetic (FM) phase. Here we show that rare-earth ferromagnetism in low dimensions is due to double-exchange mechanism. We use the bosonized version of the one-dimensional Anderson lattice model in Toulouse limit to characterize the properties of this emerging FM phase. We give a comprehensive description of the FM ordering of the correlated electrons which appears at intermediate couplings and doping. Determine the critical properties of the phase transitions into the quantum disordered paramagnetic phases. The obtained phase transitions have been identified to be an order–disorder transition of the quantum random transverse-field Ising type.

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25

Li, Yongjian, Taishan Wang, Haibing Meng, Chong Zhao, Mingzhe Nie, Li Jiang und Chunru Wang. „Controlling the magnetic properties of dysprosium metallofullerene within metal–organic frameworks“. Dalton Transactions 45, Nr. 48 (2016): 19226–29. http://dx.doi.org/10.1039/c6dt04180a.

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26

Sun, Jiaxiang, Xin Zhong, Wenwen Cui, Jingming Shi, Jian Hao, Meiling Xu und Yinwei Li. „Correction: The intrinsic magnetism, quantum anomalous Hall effect and Curie temperature in 2D transition metal trihalides“. Physical Chemistry Chemical Physics 22, Nr. 5 (2020): 3128. http://dx.doi.org/10.1039/d0cp90018d.

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Correction for ‘The intrinsic magnetism, quantum anomalous Hall effect and Curie temperature in 2D transition metal trihalides’ by Jiaxiang Sun et al., Phys. Chem. Chem. Phys., 2020, DOI: 10.1039/c9cp05084a.

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27

Hu, Dong-Sheng, Ling-Ling Ma, Shi-Chang Xiao, Shun-Li Yu und Yuan Zhou. „Quantum interference and domain–wall-like magnetic correlations in hexagonal graphene nanodisks“. Journal of Physics: Condensed Matter 34, Nr. 22 (31.03.2022): 225804. http://dx.doi.org/10.1088/1361-648x/ac533b.

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Abstract Quantum interference and traditional domain wall effects are two common ways to manipulate the magnetism in magnetic materials. Here, we report both effects emerge in the designed graphene nanodisks simultaneously, and thus providing an accessible way to engineer the magnetism in graphene nanostructures. By adjusting the length of the armchair edges at the corners of hexagonal disk, connecting the adjacent zigzag edges, we show that the quantum interference among the zigzag edges remains robust and consequently determines the magnetic structure in the small-size systems, in analogy with the nanoribbons. More importantly, a domain–wall-like magnetic mechanism is numerically identified to dominate the larger-size disks. In particular, a magnetic state with fully spin-polarized edges achieved in a wide parameter region promises the future applications for spintronics.

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28

Khumba, Paul G., und N. B. Okelo. „A Review of Operator Theory in Quantum Mechanics: A Case of Microwaves, Electricity and Magnetism“. Evolving Trends in Engineering and Technology 1 (August 2014): 1–13. http://dx.doi.org/10.18052/www.scipress.com/etet.1.1.

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We review the significance and input of operator theory in the field of quantum mechanics. In particular, we survey the world of microwaves. We also explore the applications in electricity and magnetism.

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Khumba, Paul G., und N. B. Okelo. „A Review of Operator Theory in Quantum Mechanics: A Case of Microwaves, Electricity and Magnetism“. International Journal of Engineering and Technologies 1 (04.08.2014): 1–13. http://dx.doi.org/10.56431/p-6cprg0.

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We review the significance and input of operator theory in the field of quantum mechanics. In particular, we survey the world of microwaves. We also explore the applications in electricity and magnetism.

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30

LEE, SungBin. „Frontiers of Quantum Magnetic Materials“. Physics and High Technology 31, Nr. 9 (30.09.2022): 2–6. http://dx.doi.org/10.3938/phit.31.027.

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The history of magnetism goes back to earlier than 600 b.c., but only in 20th century, people have started to understand it’s origin. Although the word ‘magnet’ may sound very familiar to you, it’s quantum nature and deep physics leads us to discover amazing phenomena. This article introduces recent frontiers of magnetic materials particularly focusing on ‘magnetic frustration and quantum spin liquids’ and discuss our current understanding.

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31

Machida, Masahiko, Keita Kobayashi und Tomio Koyama. „Quantum phases in intrinsic Josephson junctions: Quantum magnetism analogy“. Physica C: Superconductivity 491 (August 2013): 44–46. http://dx.doi.org/10.1016/j.physc.2013.02.004.

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32

Wang, Haodong, Peihan Lei, Xiaoyu Mao, Xi Kong, Xiangyu Ye, Pengfei Wang, Ya Wang et al. „Magnetic Phase Transition in Two-Dimensional CrBr₃ Probed by a Quantum Sensor“. Chinese Physics Letters 39, Nr. 4 (01.04.2022): 047601. http://dx.doi.org/10.1088/0256-307x/39/4/047601.

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Recently, magnetism in two-dimensional (2D) van der Waals (vdW) materials has attracted wide interests. It is anticipated that these materials will stimulate discovery of new physical phenomena and novel applications. The capability to quantitatively measure the magnetism of 2D magnetic vdW materials is essential to understand these materials. Here we report on quantitative measurements of ferromagnetic-to-paramagnetic phase transition of an atomically thin (down to 11 nm) vdW magnet, namely CrBr3, with a Curie point of 37.5 K. This experiment demonstrates that surface magnetism can be quantitatively investigated, which is useful for a wide variety of potential applications.

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33

Milošević, M. V., und D. Mandrus. „2D Quantum materials: Magnetism and superconductivity“. Journal of Applied Physics 130, Nr. 18 (14.11.2021): 180401. http://dx.doi.org/10.1063/5.0075774.

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34

Chandra, P., und P. Coleman. „Quantum spin nematics: Moment-free magnetism“. Physical Review Letters 66, Nr. 1 (07.01.1991): 100–103. http://dx.doi.org/10.1103/physrevlett.66.100.

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35

Weld, David M., und Wolfgang Ketterle. „Towards quantum magnetism with ultracold atoms“. Journal of Physics: Conference Series 264 (10.01.2011): 012017. http://dx.doi.org/10.1088/1742-6596/264/1/012017.

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36

Matsen, F. A. „Magnetism and spin-free quantum chemistry“. International Journal of Quantum Chemistry 6, S6 (18.06.2009): 411–17. http://dx.doi.org/10.1002/qua.560060644.

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37

Lahaye, Thierry, und Daniel Barredo. „Quantum simulation and computing with arrays of single Rydberg atoms“. Europhysics News 53, Nr. 4 (2022): 28–31. http://dx.doi.org/10.1051/epn/2022406.

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Over the last years, a new platform for quantum technologies has emerged. It is based on arrays of single atoms arranged with almost arbitrary geometries, and made to interact by exciting them to Rydberg states. Compared with other platforms, such as trapped ions or superconducting qubits, atom arrays are quite competitive for applications such as quantum simulation of magnetism. We describe the experimental methods used in this field, and illustrate recent applications.

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38

Mi, Bin Zhou, Yong Hong Xue, Huai Yu Wang, Yun Song Zhou und Xiao Lan Zhong. „Study of Magnetism of Two-Dimensional Ferromagnetic Graphene“. Advanced Materials Research 601 (Dezember 2012): 89–93. http://dx.doi.org/10.4028/www.scientific.net/amr.601.89.

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In this paper, the magnetic properties of ferromagnetic graphene nanostructures, especially the dependence of the magnetism on finite temperature, are investigated by use of the many-body Green’s function method of quantum statistical theory. The spontaneous magnetization increases with spin quantum number, and decreases with temperature. Curie temperature increases with exchange parameter J or the strength K2 of single-ion anisotropy and spin quantum number. The Curie temperature TC is directly proportional to the exchange parameter J. The spin-wave energy drops with temperature rising, and becomes zero as temperature reaches Curie temperature. As J(p,q)=0, ω1=ω2, the spin wave energy is degenerate, and the corresponding vector k=(p, q) is called the Dirac point. This study contributes to theoretical analysis for pristine two-dimensional magnetic nanomaterials that may occur in advanced experiments.

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Mi, X., A. A. Michailidis, S. Shabani, K. C. Miao, P. V. Klimov, J. Lloyd, E. Rosenberg et al. „Stable quantum-correlated many-body states through engineered dissipation“. Science 383, Nr. 6689 (22.03.2024): 1332–37. http://dx.doi.org/10.1126/science.adh9932.

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Engineered dissipative reservoirs have the potential to steer many-body quantum systems toward correlated steady states useful for quantum simulation of high-temperature superconductivity or quantum magnetism. Using up to 49 superconducting qubits, we prepared low-energy states of the transverse-field Ising model through coupling to dissipative auxiliary qubits. In one dimension, we observed long-range quantum correlations and a ground-state fidelity of 0.86 for 18 qubits at the critical point. In two dimensions, we found mutual information that extends beyond nearest neighbors. Lastly, by coupling the system to auxiliaries emulating reservoirs with different chemical potentials, we explored transport in the quantum Heisenberg model. Our results establish engineered dissipation as a scalable alternative to unitary evolution for preparing entangled many-body states on noisy quantum processors.

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Lachance-Quirion, Dany, Samuel Piotr Wolski, Yutaka Tabuchi, Shingo Kono, Koji Usami und Yasunobu Nakamura. „Entanglement-based single-shot detection of a single magnon with a superconducting qubit“. Science 367, Nr. 6476 (23.01.2020): 425–28. http://dx.doi.org/10.1126/science.aaz9236.

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The recent development of hybrid systems based on superconducting circuits provides the possibility of engineering quantum sensors that exploit different degrees of freedom. Quantum magnonics, which aims to control and read out quanta of collective spin excitations in magnetically ordered systems, provides opportunities for advances in both the study of magnetism and the development of quantum technologies. Using a superconducting qubit as a quantum sensor, we report the detection of a single magnon in a millimeter-sized ferrimagnetic crystal with a quantum efficiency of up to 0.71. The detection is based on the entanglement between a magnetostatic mode and the qubit, followed by a single-shot measurement of the qubit state. This proof-of-principle experiment establishes the single-photon detector counterpart for magnonics.

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Xu, Xianghan, Choongjae Won und Sang-Wook Cheong. „Frustrated Magnetism and Ferroelectricity in a Dy3+-Based Triangular Lattice“. Crystals 13, Nr. 6 (19.06.2023): 971. http://dx.doi.org/10.3390/cryst13060971.

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Triangular lattice magnets have attracted extensive research interest because they are potential hosts for geometrically frustrated magnetism and strong quantum fluctuations. Here, utilizing a laser floating zone technique, we report the first-time successful growth of a DyInO3 sizable crystal, which contains Dy3+-based triangular layers. The fine-tuning of Indium stoichiometry was found to be the key factor in the stabilization of the desired hexagonal phase. The X-ray diffraction study of the crystal structure reveals a non-centrosymmetric P63mc space group. Switchable polarization, i.e., ferroelectricity, and ferroelectric domain configuration are experimentally demonstrated at room temperature. Anisotropic magnetic and thermodynamic measurements unveil antiferromagnetic interactions, the absence of long-range ordering down to 0.1 K, and a possible doublet ground state, indicating a strongly frustrated magnetism. Our findings suggest that the DyInO3 crystal is an excellent platform for studying emergent phenomena and their interplay with coherent topological defects in the quantum realm.

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Shamim, Saquib, Wouter Beugeling, Jan Böttcher, Pragya Shekhar, Andreas Budewitz, Philipp Leubner, Lukas Lunczer, Ewelina M. Hankiewicz, Hartmut Buhmann und Laurens W. Molenkamp. „Emergent quantum Hall effects below 50 mT in a two-dimensional topological insulator“. Science Advances 6, Nr. 26 (Juni 2020): eaba4625. http://dx.doi.org/10.1126/sciadv.aba4625.

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The realization of the quantum spin Hall effect in HgTe quantum wells has led to the development of topological materials, which, in combination with magnetism and superconductivity, are predicted to host chiral Majorana fermions. However, the large magnetization in conventional quantum anomalous Hall systems makes it challenging to induce superconductivity. Here, we report two different emergent quantum Hall effects in (Hg,Mn)Te quantum wells. First, a previously unidentified quantum Hall state emerges from the quantum spin Hall state at an exceptionally low magnetic field of ~50 mT. Second, tuning toward the bulk p-regime, we resolve quantum Hall plateaus at fields as low as 20 to 30 mT, where transport is dominated by a van Hove singularity in the valence band. These emergent quantum Hall phenomena rely critically on the topological band structure of HgTe, and their occurrence at very low fields makes them an ideal candidate for realizing chiral Majorana fermions.

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Khumalo, Bhekuzulu. „Magnetism: Insights from the Thomas Young Experiment“. JOURNAL OF ADVANCES IN PHYSICS 19 (30.07.2021): 185–203. http://dx.doi.org/10.24297/jap.v19i.9090.

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The principles of Thomas Young’s double slit experiment are used to find out further the nature of magnetism. This paper shows that not only can magnetism be defined as a wave but it allows us to understand the nature of all waves and concept of polarization in quantum mechanics. A wave pattern results from the interactions. It is something else before it organizes into a wave formation. In all, because of the nature of magnetic phenomenon, it must be studied at close range with the double slit experiment. This gives an incredibly unique insight. All data is available at figshare.com to share.

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Moses, Amos. „Frustrated Magnetism: A Case Study of Geometric Frustration“. Advanced Journal of Science, Technology and Engineering 3, Nr. 1 (22.02.2023): 17–33. http://dx.doi.org/10.52589/ajste-gwzic1wk.

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In this research work, frustrations arising from the geometries of triangular lattices have been studied with the aid of Ising and Heisenberg models. The study reveals that geometrical frustrations can generate multiple degeneracies in the ground state. The quantum spin flip terms in the Heisenberg model are observed to play a vital role in the partial lifting up of these degeneracies. Hence, multiple degeneracies as consequence of frustrations are more pronounced for the Ising systems, which are devoid of quantum fluctuations. The observed six- and four-fold ground state degeneracies at zero field for three spins Ising and Heisenberg systems respectively are broken down to half at finite longitudinal fields. For this three-spin system, quantum phase transitions (QPT) are observed at critical longitudinal fields of J and 1.5J respectively for the Ising and Heisenberg models. At these critical fields, the ground states are observed to shift from quasi-antiferromagnet to ferromagnet. However, for the Heisenberg three-spin system in the presence of a transverse field, no transition is observed.

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Iida, Kazuki, Hiroyuki Yoshida, Hirotaka Okabe, Naoyuki Katayama, Yuto Ishii, Akihiro Koda, Yasuhiro Inamura et al. „Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc)“. Scientific Reports 9, Nr. 1 (12.02.2019). http://dx.doi.org/10.1038/s41598-018-36123-7.

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Mazzola, Federico, Wojciech Brzezicki, Maria Teresa Mercaldo, Anita Guarino, Chiara Bigi, Jill A. Miwa, Domenico De Fazio et al. „Signatures of a surface spin–orbital chiral metal“. Nature, 07.02.2024. http://dx.doi.org/10.1038/s41586-024-07033-8.

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AbstractThe relation between crystal symmetries, electron correlations and electronic structure steers the formation of a large array of unconventional phases of matter, including magneto-electric loop currents and chiral magnetism1–6. The detection of such hidden orders is an important goal in condensed-matter physics. However, until now, non-standard forms of magnetism with chiral electronic ordering have been difficult to detect experimentally7. Here we develop a theory for symmetry-broken chiral ground states and propose a methodology based on circularly polarized, spin-selective, angular-resolved photoelectron spectroscopy to study them. We use the archetypal quantum material Sr2RuO4 and reveal spectroscopic signatures that, despite being subtle, can be reconciled with the formation of spin–orbital chiral currents at the surface of the material8–10. As we shed light on these chiral regimes, our findings pave the way for a deeper understanding of ordering phenomena and unconventional magnetism.

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Barbara, B. „Quantum magnetism of single molecules and diluted rare-earth alloys“. Magnetic resonance in solids 21, Nr. 4 (2019). http://dx.doi.org/10.26907/mrsej-19404.

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48

Yuqiang Zheng und Shiyong Wang. „Delocalized magnetism in low-dimensional graphene system“. Acta Physica Sinica, 2022, 0. http://dx.doi.org/10.7498/aps.71.20220895.

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Delocalized p-shell electron magnetism emerging in the low-dimensional graphene system as a result of quantum effects is distinct from the localized d/f-shell electrons. The delocalization effect permits precisely engineering the magnetic ground state and magnetic exchange interactions in nanographenes, allowing for bottom-up construction of high-quality graphene-based magnetic quantum materials. In recent years, with advances of surface chemistry and surface physics, study the magnetism of nanographenes at single-atom precision becomes feasible, opening a new research direction for studying purely organic quantum magnetism. This review starts from summarizing the research background of nanographene magnetism. After that, the physics nature behind the nanographene magnetism and recent experimental works are discussed. In the end, challenges and opportunities for further studying low-dimensional magnetic graphenes are briefly discussed.

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Müller, Tobias, Dominik Kiese, Nils Frederic Niggemann, Björn Sbierski, Johannes Reuther, Simon Trebst, Ronny Thomale und Yasir Iqbal. „Pseudo-fermion functional renormalization group for spin models“. Reports on Progress in Physics, 19.01.2024. http://dx.doi.org/10.1088/1361-6633/ad208c.

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Abstract For decades, frustrated quantum magnets have been a seed for scientific progress and innovation in condensed matter. As much as the numerical tools for low-dimensional quantum magnetism have thrived and improved in recent years due to breakthroughs inspired by quantum information and quantum computation, higher-dimensional quantum magnetism can be considered as the final frontier, where strong quantum entanglement, multiple ordering channels, and manifold ways of paramagnetism culminate. At the same time, efforts in crystal synthesis have induced a significant increase in the number of tangible frustrated magnets which are generically three-dimensional in nature, creating an urgent need for quantitative theoretical modeling. We review the pseudo-fermion (PF) and pseudo-Majorana (PM) functional renormalization group (FRG) and their specific ability to address higher-dimensional frustrated quantum magnetism. First developed more than a decade ago, the PFFRG interprets a Heisenberg model Hamiltonian in terms of Abrikosov pseudofermions, which is then treated in a diagrammatic resummation scheme formulated as a renormalization group flow of $m$-particle pseudofermion vertices. The article reviews the state of the art of PFFRG and PMFRG and discusses their application to exemplary domains of frustrated magnetism, but most importantly, it makes the algorithmic and implementation details of these methods accessible to everyone. By thus lowering the entry barrier to their application, we hope that this review will contribute towards establishing PFFRG and PMFRG as the numerical methods for addressing frustrated quantum magnetism in higher spatial dimensions.

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Xu, Wei-Xing. „The Magnetism from the Movement of Electron in Hydrogen Atom“. Current Journal of Applied Science and Technology, 26.10.2021, 34–40. http://dx.doi.org/10.9734/cjast/2021/v40i3031544.

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In this work we calculated the magnetism from the movement of electron in hydrogen atom and found that the contributions from the electron in the same main quantum levels to the magnetism of the hydrogen atom are the same; but the contributions from the electron in different main quantum levels to the magnetism of the hydrogen atom are the eigenvalue dependent instead. These facts tell us that the concepts about “intrinsic property” and “relativity effect” of electron spin should be discarded, and accordingly, the quantum mechanics should be rebuilt.

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