Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate

Shen, Yao; Li, Yao-Dong; Wo, Hongliang; Li, Yuesheng; Shen, Shoudong; Pan, Bingying; Wang, Qisi; Walker, H. C.; Steffens, P.; Boehm, M.; Hao, Yiqing; Quintero-Castro, D. L.; Harriger, L. W.; Frontzek, M. D.; Hao, Lijie; Meng, Siqin; Zhang, Qingming; Chen, Gang; Zhao, Jun

doi:10.1038/nature20614

Title: Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate

Journal Article · Mon Dec 05 00:00:00 EST 2016 · Nature (London)

DOI:https://doi.org/10.1038/nature20614· OSTI ID:1335366

Shen, Yao ^[1]; Li, Yao-Dong ^[1]; Wo, Hongliang ^[1]; Li, Yuesheng ^[2]; Shen, Shoudong ^[1]; Pan, Bingying ^[1]; Wang, Qisi ^[1]; Walker, H. C. ^[3]; Steffens, P. ^[4]; Boehm, M. ^[4]; Hao, Yiqing ^[1]; Quintero-Castro, D. L. ^[5]; Harriger, L. W. ^[6]; Frontzek, M. D. ^[7]; Hao, Lijie ^[8]; Meng, Siqin ^[8]; Zhang, Qingming ^[2]; Chen, Gang ^[1]; Zhao, Jun ^[1]

Fudan Univ., Shanghai (China)
Renmin Univ. of China, Beijing (China)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
Inst. Laue-Langevin (ILL), Grenoble (France)
Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
China Inst. of Atomic Energy (CIAE), Beijing (China)

A quantum spin liquid is an exotic quantum state of matter in which spins are highly entangled and remain disordered down to zero temperature. Such a state of matter is potentially relevant to high-temperature superconductivity and quantum-information applications, and experimental identification of a quantum spin liquid state is of fundamental importance for our understanding of quantum matter. Theoretical studies have proposed various quantum-spin-liquid ground states, most of which are characterized by exotic spin excitations with fractional quantum numbers (termed ‘spinons’). In this paper, we report neutron scattering measurements of the triangular-lattice antiferromagnet YbMgGaO₄ that reveal broad spin excitations covering a wide region of the Brillouin zone. The observed diffusive spin excitation persists at the lowest measured energy and shows a clear upper excitation edge, consistent with the particle–hole excitation of a spinon Fermi surface. Finally, our results therefore point to the existence of a quantum spin liquid state with a spinon Fermi surface in YbMgGaO₄, which has a perfect spin-1/2 triangular lattice as in the original proposal of quantum spin liquids.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Fudan Univ., Shanghai (China)

Sponsoring Organization:: USDOE Office of Science (SC); National Key R&D Program of the MOST (China); Ministry of Science and Technology (China); National Natural Science Foundation of China (NSFC)

Contributing Organization:: Helmholtz-Zentrum Berlin for Materials and Energy, Berlin (Germany); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); China Inst. of Atomic Energy (CIAE), Beijing (China); Renmin Univ. of China, Beijing (China); Shanghai Jiao Tong Univ. (China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (China); Inst. Laue-Langevin, Grenoble (France); Science and Technology Facilities Council (STFC), Chilton (United Kingdom)

Grant/Contract Number:: AC05-00OR22725; 2016YFA0300203; 2015CB921302; 91421106; 2016YFA0300504

OSTI ID:: 1335366

Journal Information:: Nature (London), Vol. 540; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 214 works

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Intertwined dipolar and multipolar order in the triangular-lattice magnet TmMgGaO$_4$ Shen, Yao; Liu, Changle; Qin, Yayuan arXiv https://doi.org/10.48550/arxiv.1810.05054	text	January 2018
Anisotropic-Exchange Magnets on a Triangular Lattice: Spin Waves, Accidental Degeneracies, and Dual Spin Liquids Maksimov, P. A.; Zhu, Zhenyue; White, Steven R. arXiv https://doi.org/10.48550/arxiv.1811.05983	text	January 2018
Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore Gao, Bin; Chen, Tong; Tam, David W. arXiv https://doi.org/10.48550/arxiv.1901.10092	text	January 2019
Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc) Iida, K.; Yoshida, H.; Okabe, H. arXiv https://doi.org/10.48550/arxiv.1902.06407	text	January 2019
Quantum Spin Liquids Broholm, C.; Cava, R. J.; Kivelson, S. A. arXiv https://doi.org/10.48550/arxiv.1905.07040	text	January 2019
Resolving continua of fractional excitations by spinon echo in THz 2D coherent spectroscopy Wan, Yuan; Armitage, N. P. arXiv https://doi.org/10.48550/arxiv.1905.11420	text	January 2019
Nature of the randomness-induced quantum spin liquids in two dimensions Kawamura, Hikaru; Uematsu, Kazuki arXiv https://doi.org/10.48550/arxiv.1907.06176	text	January 2019
Frustrated Magnetism in Triangular Lattice TlYbS$_2$ Crystals Grown via Molten Flux Ferreira, Timothy; Xing, Jie; Sanjeewa, Liurukara D. arXiv https://doi.org/10.48550/arxiv.2003.03321	text	January 2020
Quantum-disordered state of magnetic and electric dipoles in an organic Mott system Shimozawa, M.; Hashimoto, K.; Ueda, A. Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-01849-x	journal	November 2017
Kosterlitz-Thouless Melting of Magnetic Order in the Triangular Quantum Ising Material TmMgGaO$_4$ Li, Han; Da Liao, Yuan; Chen, Bin-Bin arXiv https://doi.org/10.48550/arxiv.1907.08173	text	January 2019

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