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Artykuły w czasopismach na temat „Low Dimensional Quantum Spin Systems”

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Data publikacji: 7 września 2023

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1

Dillenschneider, Raoul, Jung Hoon Kim, and Jung Hoon Han. "Vector Chiral States in Low-Dimensional Quantum-Spin Systems." Journal of the Korean Physical Society 53, no. 2 (2008): 732–36. http://dx.doi.org/10.3938/jkps.53.732.

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2

Wolf, B., S. Zherlitsyn, U. Löw, B. Lüthi, V. Pashchenko, and M. Lang. "Low-dimensional quantum spin systems in pulsed magnetic fields." Physica B: Condensed Matter 346-347 (April 2004): 19–26. http://dx.doi.org/10.1016/j.physb.2004.01.013.

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3

Lemmens, P., G. Güntherodt, and C. Gros. "Magnetic light scattering in low-dimensional quantum spin systems." Physics Reports 375, no. 1 (2003): 1–103. http://dx.doi.org/10.1016/s0370-1573(02)00321-6.

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4

Lima, Leonardo S. "Entanglement Negativity and Concurrence in Some Low-Dimensional Spin Systems." Entropy 24, no. 11 (2022): 1629. http://dx.doi.org/10.3390/e24111629.

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The influence of magnon bands on entanglement in the antiferromagnetic XXZ model on a triangular lattice, which models the bilayer structure consisting of an antiferromagnetic insulator and normal metal, is investigated. This effect was studied in ferromagnetic as well as antiferromagnetic triangular lattices. Quantum entanglement measures given by the entanglement negativity have been studied, where a magnon current is induced in the antiferromagnet due to interfacial exchange coupling between localized spins in the antiferromagnet and itinerant electrons in a normal metal. Moreover, quantum

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5

HORVATIĆ, M., and C. BERTHIER. "HIGH FIELD NMR IN STRONGLY CORRELATED LOW-DIMENSIONAL FERMIONIC SYSTEMS." International Journal of Modern Physics B 16, no. 20n22 (2002): 3265–70. http://dx.doi.org/10.1142/s0217979202014127.

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We review some recent NMR results obtained in Grenoble High Magnetic Field Laboratory on magnetic field induced phenomena in strongly correlated low-dimensional fermionic systems: i) magnetic field dependence of the soliton lattice in the IC phase of the spin-Peierls system CuGeO3, ii) NMR study of the complete H-T phase diagram of the organo-metallic spin ladder Cu2(C5H12N2)2Cl4, and iii) the first "standard" NMR measurements (i.e., without optical pumping) on 2D electrons in Quantum wells, providing a detailed description of the fractional quantum Hall effect state at ν = 1/2 with the first

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6

Ercolessi, Elisa. "ONE AND QUASI-ONE DIMENSIONAL SPIN SYSTEMS." Modern Physics Letters A 18, no. 33n35 (2003): 2329–36. http://dx.doi.org/10.1142/s0217732303012544.

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Quantum spin models represent one of the most studied examples of application of low-dimensional field theories to condensed matter systems. In this paper we will review some chapters of this hystory, that dates back to the early '80, when Haldane put forward his by now famous conjecture on antiferromagnetic spin chains, and reaches the present days, with the most advanced applications of integrable models and conformal field theory.

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7

Saha-Dasgupta, Tanusri. "The Fascinating World of Low-Dimensional Quantum Spin Systems: Ab Initio Modeling." Molecules 26, no. 6 (2021): 1522. http://dx.doi.org/10.3390/molecules26061522.

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In recent times, ab initio density functional theory has emerged as a powerful tool for making the connection between models and materials. Insulating transition metal oxides with a small spin forms a fascinating class of strongly correlated systems that exhibit spin-gap states, spin–charge separation, quantum criticality, superconductivity, etc. The coupling between spin, charge, and orbital degrees of freedom makes the chemical insights equally important to the strong correlation effects. In this review, we establish the usefulness of ab initio tools within the framework of the N-th order mu

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8

Ohta, H., S. Okubo, S. Kimura, et al. "Submillimeter-wave ESR measurements of low-dimensional quantum spin systems." Applied Magnetic Resonance 18, no. 4 (2000): 469–74. http://dx.doi.org/10.1007/bf03162293.

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9

Wang, Dong-Sheng. "Classes of topological qubits from low-dimensional quantum spin systems." Annals of Physics 412 (January 2020): 168015. http://dx.doi.org/10.1016/j.aop.2019.168015.

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10

WOLF, B., S. ZHERLITSYN, S. SCHMIDT, B. LÜTHI, and M. LANG. "PULSE-FIELD EXPERIMENTS ON THE SPIN-LATTICE INTERACTION IN LOW-DIMENSIONAL SPIN SYSTEMS." International Journal of Modern Physics B 16, no. 20n22 (2002): 3369–72. http://dx.doi.org/10.1142/s0217979202014449.

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Low-dimensional spin systems reveal new and unexpected physical phenomena such as distinct plateaus in the magnetization as a function of magnetic field. In this paper we present ultrasonic measurements for the quasi-two-dimensional spin system SrCu2(BO3)2 in magnetic fields up to 50 T. From this technique we obtained detailed information about the spin state, the magnetic excitations and their interaction with phonons. The dimerized quantum-spin system SrCu2(BO3)2 exhibits plateaus in the magnetization and shows surprisingly strong magneto-elastic effects as a function of temperature and magn

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11

Ding, L. J., K. L. Yao, and H. H. Fu. "Spin-Peierls transition in low-dimensional quantum spin systems: a Green’s function approach." Physical Chemistry Chemical Physics 11, no. 48 (2009): 11415. http://dx.doi.org/10.1039/b913654a.

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12

LHUILLIER, C., B. BERNU, and G. MISGUICH. "GEOMETRICALLY FRUSTRATED QUANTUM ANTIFERROMAGNETS AND SPIN-LIQUIDS." International Journal of Modern Physics B 13, no. 05n06 (1999): 687–95. http://dx.doi.org/10.1142/s0217979299000588.

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We briefly review experimental and theoretical results related to the problem of long range magnetic order in geometrically frustrated 2-dimensional quantum antiferromagnets. We show that 2-dimensional He3 at low coverage is a good candidate as a Spin-Liquid. We underline that sophisticated numerical studies of the spectra of such systems point at least to two different kinds of Spin-Liquids.

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13

Alexander, Rafael N., Glen Evenbly, and Israel Klich. "Exact holographic tensor networks for the Motzkin spin chain." Quantum 5 (September 21, 2021): 546. http://dx.doi.org/10.22331/q-2021-09-21-546.

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The study of low-dimensional quantum systems has proven to be a particularly fertile field for discovering novel types of quantum matter. When studied numerically, low-energy states of low-dimensional quantum systems are often approximated via a tensor-network description. The tensor network's utility in studying short range correlated states in 1D have been thoroughly investigated, with numerous examples where the treatment is essentially exact. Yet, despite the large number of works investigating these networks and their relations to physical models, examples of exact correspondence between

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14

Tomic, S., T. Vuletic, M. Pinteric, and B. Korin-Hamzic. "Modalities of self-organized charge response in low dimensional systems." Journal de Physique IV 12, no. 9 (2002): 211–14. http://dx.doi.org/10.1051/jp4:20020397.

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We present modalities of self-organized charge response in low dimensional systems, like diverse organic and quantum spin systems, studied by the low-frequency (10 mHz – 1 MHz) dielectric spectroscopy. Density wave structures with the order of commensurability N = 4 can be recognized as phasons in a random impurity potential, whereas those with N = 3 can be viewed as topological defects like charge domain wall pairs in the background domain structure.

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15

BRAUN, HANS-BENJAMIN, and DANIEL LOSS. "CHIRALITY CORRELATION OF SPIN SOLITONS: BLOCH WALLS, SPIN-½ SOLITONS AND HOLES IN A 2D ANTIFERROMAGNETIC BACKGROUND." International Journal of Modern Physics B 10, no. 02 (1996): 219–34. http://dx.doi.org/10.1142/s021797929600009x.

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We consider the quantum dynamics of spin solitons in a variety of low-dimensional magnetic systems in the semiclassical and the extreme quantum limit. Introducing the concept of chirality of the soliton we derive the dispersion of spin solitons moving through a periodic pinning potential and show that for half-odd integer spin the topological part of the Berry phase induces a halving of the Brillouin zone as well as chirality correlations between subsequent band minima. We demonstrate that these chirality and spin parity effects are universal by considering quasi-one-dimensional ferromagnets a

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16

ANGELUCCI, ANTIMO, and GIANCARLO JUG. "NOVEL PATH INTEGRAL APPROACH TO EFFECTIVE FIELD THEORIES FOR D-DIMENSIONAL QUANTUM SPIN SYSTEMS." International Journal of Modern Physics B 03, no. 07 (1989): 1069–83. http://dx.doi.org/10.1142/s0217979289000737.

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We present a novel path integral formulation for the effective field theory describing d-dimensional quantum spin models. The new approach avoids the coherent states representation, but at very low temperatures reproduces all known results obtained with the latter technique for describing excitations of the Neél state. The possibility of exploring higher-temperature, unbroken-symmetry state excitations (such as those appropriate for the quantum spin-liquid state) within this method is illustrated.

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17

Kamieniarz, G., G. Musial, L. Dębski, M. Bieliński, and R. Dekeyser. "Quantum Effects and Critical Behavior in Low-Dimensional Spin-1/2 Systems." Acta Physica Polonica A 92, no. 2 (1997): 445–47. http://dx.doi.org/10.12693/aphyspola.92.445.

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18

Wei, Di S., Toeno van der Sar, Seung Hwan Lee, et al. "Electrical generation and detection of spin waves in a quantum Hall ferromagnet." Science 362, no. 6411 (2018): 229–33. http://dx.doi.org/10.1126/science.aar4061.

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Spin waves are collective excitations of magnetic systems. An attractive setting for studying long-lived spin-wave physics is the quantum Hall (QH) ferromagnet, which forms spontaneously in clean two-dimensional electron systems at low temperature and in a perpendicular magnetic field. We used out-of-equilibrium occupation of QH edge channels in graphene to excite and detect spin waves in magnetically ordered QH states. Our experiments provide direct evidence for long-distance spin-wave propagation through different ferromagnetic phases in the N = 0 Landau level, as well as across the insulati

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19

Shamim, Saquib, Wouter Beugeling, Jan Böttcher, et al. "Emergent quantum Hall effects below 50 mT in a two-dimensional topological insulator." Science Advances 6, no. 26 (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,

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20

Clark, Lucy, and Aly H. Abdeldaim. "Quantum Spin Liquids from a Materials Perspective." Annual Review of Materials Research 51, no. 1 (2021): 495–519. http://dx.doi.org/10.1146/annurev-matsci-080819-011453.

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Quantum spin liquids are unique quantum states of matter predicted to arise in low-dimensional, frustrated, and quantum magnetic systems. Compared with conventional ferromagnetic and antiferromagnetic states, quantum spin liquids are expected to display a variety of novel and exotic properties, making their realization in materials a highly appealing prospect. While an unambiguous realization of this long-sought-after state remains elusive, a growing number of materials candidates show promise in revealing the properties of quantum spin liquids. In this review, we present some of the key chall

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21

Glatz, A., and T. Nattermann. "Quantum phase slips and thermal fluctuations in one-dimensional disordered density waves." Journal de Physique IV 12, no. 9 (2002): 123–26. http://dx.doi.org/10.1051/jp4:20020376.

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The low temperature phase diagram of 1D disordered quantum systems like charge or spin density waves, superfluids, and related systems is considered by a full finite T renormalization group approach for the first time. At zero temperature the consideration of quantum phase slips leads to a new scenario for the unpinning (delocalization) transition. In the strong pinning limit the model is solved exactly. At finite T a rich crossover diagram with various scaling regions is found which reflects the zero temperature quantum critical behavior.

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22

Ohta, Hitoshi, Susumu Okubo, Yuji Inagaki, Zenji Hiroi, and Hikomitsu Kikuchi. "Recent high field ESR studies of low-dimensional quantum spin systems in Kobe." Physica B: Condensed Matter 346-347 (April 2004): 38–44. http://dx.doi.org/10.1016/j.physb.2004.01.016.

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23

Rajashabala, S., and K. Navaneethakrishnan. "Pressure effects on the spin–orbit interactions in low-dimensional quantum well systems." Physica E: Low-dimensional Systems and Nanostructures 40, no. 4 (2008): 843–48. http://dx.doi.org/10.1016/j.physe.2007.10.104.

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24

Richert, Jean, and Otfried Gühne. "Low energy properties of even-leggedd-dimensional quantum spin systems: a variational approach." physica status solidi (b) 245, no. 8 (2008): 1552–62. http://dx.doi.org/10.1002/pssb.200743512.

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25

Wolf, B., S. Zherlitsyn, S. Schmidt, and B. L�thi. "Low-Dimensional Quantum Spin Systems in Pulsed Magnetic Fields up to 50 T." physica status solidi (a) 189, no. 2 (2002): 389–96. http://dx.doi.org/10.1002/1521-396x(200202)189:2<389::aid-pssa389>3.0.co;2-p.

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26

Kakurai, K., M. Nishi, K. Nakajima, et al. "Neutron scattering experiments on low-dimensional quantum spin systems—Spin excitations in KCuCl3 and SrCu2(BO3)2." Journal of Physics and Chemistry of Solids 62, no. 1-2 (2001): 141–47. http://dx.doi.org/10.1016/s0022-3697(00)00116-5.

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27

YOU, WEN-LONG, and WEN-LONG LU. "GROUND-STATE CORRELATION ENTROPY IN THE ONE- AND TWO-DIMENSIONAL XXZ MODEL." International Journal of Modern Physics B 25, no. 02 (2011): 231–41. http://dx.doi.org/10.1142/s0217979211057815.

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In this paper, we study quantum phase transitions in both the one- (1D) and two-dimensional (2D) spin 1/2 XXZ models by a two-site correlation entropy. We show that the behavior of the correlation entropy is related to the ground-state symmetries and low-lying excitations of these systems. Therefore, the anomalies and minimum behaviors of the correlation entropy can signal the quantum phase transition points in the ground state of both models.

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28

Cheranovskii, Vladislav O., Viktor V. Slavin, Elena V. Ezerskaya, Andrei L. Tchougréeff, and Richard Dronskowski. "Magnetic Properties of Quasi-One-Dimensional Crystals Formed by Graphene Nanoclusters and Embedded Atoms of the Transition Metals." Crystals 9, no. 5 (2019): 251. http://dx.doi.org/10.3390/cryst9050251.

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Using the density-matrix renormalization group method and quantum Monte Carlo simulation, we studied numerically the energy spectrum and thermodynamics of the quantum Heisenberg spin model for narrow graphene nanoribbons and their derivatives with periodically embedded heteroatoms. For several nanoribbon structures we found macroscopic ground state spin, gapless lowest excitation spectra and intermediate magnetization plateaus at low temperatures. We also studied the lowest energy states of frustrated systems formed by triangular graphitic clusters connected by bridged ions of transition metal

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29

KISHINE, JUN-ICHIRO, and KENJI YONEMITSU. "DIMENSIONAL CROSSOVERS AND PHASE TRANSITIONS IN STRONGLY CORRELATED LOW-DIMENSIONAL ELECTRON SYSTEMS: RENORMALIZATION-GROUP STUDY." International Journal of Modern Physics B 16, no. 05 (2002): 711–71. http://dx.doi.org/10.1142/s0217979202009962.

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Based on the perturbative renormalization-group (PRG) approach, we have examined interplay or competition between one-particle (1P) and two-particle (2P) processes in strongly correlated low-dimensional electron systems. Throughout the article, we use the Grassmann functional integral approach, since it has an advantage that the 1P degrees of freedom are incorporated in an explicit manner. We mainly discuss an array of chains weakly-coupled via interchain one-particle hopping, where the constituent chains, if isolated, have a strong-coupling fixed point, such as the Mott-insulator, spin-gap-me

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30

Zivieri, Roberto. "Absence of Spontaneous Spin Symmetry Breaking in 1D and 2D Quantum Ferromagnetic Systems with Bilinear and Biquadratic Exchange Interactions." Symmetry 12, no. 12 (2020): 2061. http://dx.doi.org/10.3390/sym12122061.

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Some measurements have shown that the second-order exchange interaction is non-negligible in ferromagnetic compounds whose microscopic interactions are described by means of half-odd integer quantum spins. In these spin systems the ground state is either ferromagnetic or antiferromagnetic when the bilinear exchange interaction is dominant. Instead, in ferromagnetic systems characterized by bilinear and biquadratic exchange interactions of comparable magnitude, the energy minimum occurs when spins are in a canting ground-state. To this aim, a one-dimensional (1D) quantum spin chain and a two-di

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31

Cangas, R., and M. A. Hidalgo. "Influence of the Spin–Orbit Interaction on the Magnetotransport Properties of a Two-Dimensional Electron System." SPIN 05, no. 03 (2015): 1530003. http://dx.doi.org/10.1142/s2010324715300030.

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In this paper, we review the contribution of the Rashba spin–orbit coupling to the magnetoconduction of a two-dimensional electron system (2DES) confined in an inversion layer under quantum Hall regime (low temperature and low defects and impurities). The study is based on a semi-classical model for the magnetoconductivities of the 2DES. This model reproduces the measurements of the Shubnikov-de Haas (SdH) oscillations obtained in systems confined in III–V heterostructures, and also the quantum Hall magnetoconductivity (magnetoresistivity). We also discuss the Rashba and Zeeman competition and

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32

NUSSINOV, ZOHAR, CRISTIAN D. BATISTA, and EDUARDO FRADKIN. "INTERMEDIATE SYMMETRIES IN ELECTRONIC SYSTEMS: DIMENSIONAL REDUCTION, ORDER OUT OF DISORDER, DUALITIES, AND FRACTIONALIZATION." International Journal of Modern Physics B 20, no. 30n31 (2006): 5239–49. http://dx.doi.org/10.1142/s0217979206036326.

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We discuss symmetries intermediate between global and local and formalize the notion of dimensional reduction adduced from such symmetries. We apply this generalization to several systems including liquid crystalline phases of Quantum Hall systems, transition metal orbital systems, frustrated spin systems, ( p + ip ) superconducting arrays, and sliding Luttinger liquids. By considering space-time reflection symmetries, we illustrate that several of these systems are dual to each other. In some systems exhibiting these symmetries, low temperature local orders emerge by an "order out of disorder

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33

GETHING, J. D., A. J. MATTHEWS, A. USHER, M. E. PORTNOI, K. V. KAVOKIN, and M. HENINI. "BREAKDOWN OF THE QUANTUM HALL EFFECTS IN HOLE SYSTEMS AT HIGH INDUCED CURRENTS." International Journal of Modern Physics B 18, no. 27n29 (2004): 3537–40. http://dx.doi.org/10.1142/s0217979204026962.

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The magnetisation of two dimensional hole systems in the quantum Hall regime has been studied using a highly-sensitive torsion balance magnetometer. In a time varying magnetic field eddy currents are induced which become large around integer and fractional filling factors where ρxx takes a very low value. The sweep rate and temperature dependence of these induced currents are in good agreement with the model of quantum Hall effect breakdown proposed recently by Matthews et al. This model also allows comparison between the energy gap at different filling factors and so provides a measurement of

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34

Nys, Jannes, and Giuseppe Carleo. "Variational solutions to fermion-to-qubit mappings in two spatial dimensions." Quantum 6 (October 13, 2022): 833. http://dx.doi.org/10.22331/q-2022-10-13-833.

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Through the introduction of auxiliary fermions, or an enlarged spin space, one can map local fermion Hamiltonians onto local spin Hamiltonians, at the expense of introducing a set of additional constraints. We present a variational Monte-Carlo framework to study fermionic systems through higher-dimensional (&#x003E;1D) Jordan-Wigner transformations. We provide exact solutions to the parity and Gauss-law constraints that are encountered in bosonization procedures. We study the t-V model in 2D and demonstrate how both the ground state and the low-energy excitation spectra can be retrieved in

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35

Moutanabbir, Oussama, Patrick Del Vecchio, Anis Attiaoui, Gabriel Fettu, Nicolas Rotaru, and Simone Assali. "(Invited) Optoelectronic Quantum Information Processing: An All-Group IV Integrated Platform." ECS Meeting Abstracts MA2022-02, no. 32 (2022): 1207. http://dx.doi.org/10.1149/ma2022-02321207mtgabs.

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Achieving coherent optical photon-to-spin conversion is a long-sought-after strategy for surmounting current fundamental limits in optical schemes that hinder the long-distance distribution of entanglement. Moreover, photon-to-spin interfaces are also essential for a direct mapping of the quantum information encoded in photon flying qubits to stationary spin processors. However, the lack of scalable materials offering an efficient interaction with optical photons along with optimal spin properties remains a formidable obstacle hindering the development of these quantum technological components

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36

Senaratne, Ruwan, Danyel Cavazos-Cavazos, Sheng Wang, et al. "Spin-charge separation in a one-dimensional Fermi gas with tunable interactions." Science 376, no. 6599 (2022): 1305–8. http://dx.doi.org/10.1126/science.abn1719.

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Ultracold atoms confined to periodic potentials have proven to be a powerful tool for quantum simulation of complex many-body systems. We confine fermions to one dimension to realize the Tomonaga-Luttinger liquid model, which describes the highly collective nature of their low-energy excitations. We use Bragg spectroscopy to directly excite either the spin or charge waves for various strengths of repulsive interaction. We observe that the velocity of the spin and charge excitations shift in opposite directions with increasing interaction, a hallmark of spin-charge separation. The excitation sp

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37

Hosokoshi, Yuko, Yasuhiro Nakazawa, Katsuya Inoue, et al. "Magnetic properties of low-dimensional quantum spin systems made of stable organic biradicals PNNNO,F2PNNNO,and PIMNO." Physical Review B 60, no. 18 (1999): 12924–32. http://dx.doi.org/10.1103/physrevb.60.12924.

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38

Wolf, B., A. Brühl, J. Magerkurth, et al. "Magnetoelastic and magnetothermal properties of low-dimensional quantum spin systems in high magnetic fields—a case study." Journal of Magnetism and Magnetic Materials 290-291 (April 2005): 411–15. http://dx.doi.org/10.1016/j.jmmm.2004.11.495.

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Yamamoto, Shoji. "An Efficient Monte Carlo Approach to Low-Lying Excitations of Quantum Spin Chains." International Journal of Modern Physics C 08, no. 03 (1997): 609–34. http://dx.doi.org/10.1142/s0129183197000527.

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We give a full description of a recently developed efficient Monte Carlo Approach to low-lying excitations of one-dimensional quantum spin systems. The idea is in a word expressed as extracting the lower edge of the excitation spectrum from imaginary-time quantum Monte Carlo data at a sufficiently low temperature. First, the method is applied to the antiferromagnetic Heisenberg chains of S=1/2, 1, 3/2, and 2. In the cases of S=1/2 and S=1, comparing the present results with the previous findings, we discuss the reliability of the method. The spectra for S=3/2 and S=2 turn out to be massless an

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40

Fazzini, Serena, and Arianna Montorsi. "Hidden Charge Orders in Low-Dimensional Mott Insulators." Applied Sciences 9, no. 4 (2019): 784. http://dx.doi.org/10.3390/app9040784.

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The opening of a charge gap driven by interaction is a fingerprint of the transition to a Mott insulating phase. In strongly correlated low-dimensional quantum systems, it can be associated to the ordering of hidden non-local operators. For Fermionic 1D models, in the presence of spin–charge separation and short-ranged interaction, a bosonization analysis proves that such operators are the parity and/or string charge operators. In fact, a finite fractional non-local parity charge order is also capable of characterizing some two-dimensional Mott insulators, in both the Fermionic and the bosonic

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41

Azzouz, Mohamed. "Topological Monopoles in Quantum Antiferromagnets." Symmetry 11, no. 3 (2019): 323. http://dx.doi.org/10.3390/sym11030323.

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While the observation of magnetic monopoles has defied all experimental attempts in high-energy physics and astrophysics, sound theoretical approaches predict that they should exist, and they have indeed been observed as quasiparticle excitations in certain condensed-matter systems. This indicates that, even though they are not ubiquitous contrary to electrons, it is possible to get them as excitations above a background. In this report, we show that phonons or lattice shear strain generate topological monopoles in some low-dimensional quantum antiferromagnets. For the Heisenberg ladder, phono

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Brown, Peter T., Debayan Mitra, Elmer Guardado-Sanchez, et al. "Spin-imbalance in a 2D Fermi-Hubbard system." Science 357, no. 6358 (2017): 1385–88. http://dx.doi.org/10.1126/science.aam7838.

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The interplay of strong interactions and magnetic fields gives rise to unusual forms of superconductivity and magnetism in quantum many-body systems. Here, we present an experimental study of the two-dimensional Fermi-Hubbard model—a paradigm for strongly correlated fermions on a lattice—in the presence of a Zeeman field and varying doping. Using site-resolved measurements, we revealed anisotropic antiferromagnetic correlations, a precursor to long-range canted order. We observed nonmonotonic behavior of the local polarization with doping for strong interactions, which we attribute to the evol

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Masuda, Hidetoshi, Hideaki Sakai, Masashi Tokunaga, et al. "Quantum Hall effect in a bulk antiferromagnet EuMnBi2 with magnetically confined two-dimensional Dirac fermions." Science Advances 2, no. 1 (2016): e1501117. http://dx.doi.org/10.1126/sciadv.1501117.

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For the innovation of spintronic technologies, Dirac materials, in which low-energy excitation is described as relativistic Dirac fermions, are one of the most promising systems because of the fascinating magnetotransport associated with extremely high mobility. To incorporate Dirac fermions into spintronic applications, their quantum transport phenomena are desired to be manipulated to a large extent by magnetic order in a solid. We report a bulk half-integer quantum Hall effect in a layered antiferromagnet EuMnBi2, in which field-controllable Eu magnetic order significantly suppresses the in

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Chen Xiao-Bin and Duan Wen-Hui. "Quantum thermal transport and spin thermoelectrics in low-dimensional nano systems: application of nonequilibrium Green's function method." Acta Physica Sinica 64, no. 18 (2015): 186302. http://dx.doi.org/10.7498/aps.64.186302.

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LEE, C. W. H., and S. G. RAJEEV. "A REVIEW OF SYMMETRY ALGEBRAS OF QUANTUM MATRIX MODELS IN THE LARGE N LIMIT." International Journal of Modern Physics A 14, no. 28 (1999): 4395–455. http://dx.doi.org/10.1142/s0217751x99002074.

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This is a review article in which we will introduce, in a unifying fashion and with more intermediate steps in some difficult calculations, two infinite-dimensional Lie algebras of quantum matrix models, one for the open string sector and the other for the closed string sector. Physical observables of quantum matrix models in the large N limit can be expressed as elements of these Lie algebras. We will see that both algebras arise as quotient algebras of a larger Lie algebra. We will also discuss some properties of these Lie algebras not published elsewhere yet, and briefly review their relati

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Bykov, Maxim, Elena Bykova, Leonid Dubrovinsky, et al. "Pressure-induced normal-incommensurate-commensurate phase transitions in TiPO4." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C263. http://dx.doi.org/10.1107/s2053273314097368.

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The complex interplay between spin, charge, orbital, and lattice degrees of freedom has made low-dimensional quantum spin magnets with strong antiferromagnetic (AF) spin-exchange coupling prime candidates for studying unusual magnetic phenomena. A progressive spin-lattice dimerization in one-dimensional AF Heisenberg chains, which occurs below a critical temperature and induces a singlet ground state with a magnetic gap, is commonly referred to as spin-Peierls (SP) transition. Recently, the compounds TiOX (X = Cl, Br) and TiPO4have been intensively investigated due to their unconventional beha

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Hsu, Chen-Hsuan, Peter Stano, Jelena Klinovaja, and Daniel Loss. "Helical liquids in semiconductors." Semiconductor Science and Technology 36, no. 12 (2021): 123003. http://dx.doi.org/10.1088/1361-6641/ac2c27.

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Abstract One-dimensional helical liquids can appear at boundaries of certain condensed matter systems. Two prime examples are the edge of a quantum spin Hall insulator and the hinge of a three-dimensional second-order topological insulator. For these materials, the presence of a helical state at the boundary serves as a signature of their nontrivial electronic bulk topology. Additionally, these boundary states are of interest themselves, as a novel class of strongly correlated low-dimensional systems with interesting potential applications. Here, we review existing results on such helical liqu

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Villarreal, Renan. "(Invited, Digital Presentation) Single-Atom Quantum Magnetism in 2D Materials." ECS Meeting Abstracts MA2022-01, no. 12 (2022): 874. http://dx.doi.org/10.1149/ma2022-0112874mtgabs.

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With the advent of 2D materials, the playground to study spins in dilute and non-dilute phases has expanded. This is appealing for utilizing the additional degrees of freedom of electron systems such as spin and valley and, from the fundamental point of view, to better understand atomic scale magnetic phenomena in low dimensional materials. Dilute magnetism in 2D materials can lead to complex magnetic phenomena (e.g., Kondo effect, RKKY-interactions, quantum relaxation and coherence), with potential for applications in spintronics (e.g., spin FETs) and quantum technologies (e.g., single-atom q

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Mukhin, S. I., and S. I. Matveenko. "Stripe Phase: Analytical Results for Weakly Coupled Repulsive Hubbard Model." International Journal of Modern Physics B 17, no. 21 (2003): 3749–83. http://dx.doi.org/10.1142/s0217979203022726.

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Motivated by the stripe developments in cuprates, we review analytical results for the spin-charge solitonic superstructures derived in the framework of the Hubbard model in our studies of weakly coupled (quasi) one-dimensional repulsive electron systems on a lattice. These results demonstrate that close to half filling, in the high temperature regime above the mean field transition temperature, short range repulsions favor charge density fluctuations with wavevectors bearing special relations with those of the spin density fluctuations. In the low temperature regime, besides the wavevectors,

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WEN, X. G. "TOPOLOGICAL ORDERS IN RIGID STATES." International Journal of Modern Physics B 04, no. 02 (1990): 239–71. http://dx.doi.org/10.1142/s0217979290000139.

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We study a new kind of ordering — topological order — in rigid states (the states with no local gapless excitations). We concentrate on characterization of the different topological orders. As an example we discuss in detail chiral spin states of 2 + 1 dimensional spin systems. Chiral spin states are described by the topological Chern-Simons theories in the continuum limit. We show that the topological orders can be characterized by a non-Abelian gauge structure over the moduli space which parametrizes a family of the model Hamiltonians supporting topologically ordered ground states. In 2 + 1

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