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Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T–TaS2

He, Wen-Yu ; Xu, Xiao Yan ; Chen, Gang ; Law, K.  T. ; Lee, Patrick A.

Physical review letters, 2018-07, Vol.121 (4) [Periódico revisado por pares]

United States: American Physical Society (APS)

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  • Título:
    Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T–TaS2
  • Autor: He, Wen-Yu ; Xu, Xiao Yan ; Chen, Gang ; Law, K.  T. ; Lee, Patrick A.
  • Assuntos: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Density matrix renormalization group ; Quantum spin liquid ; Transition-metal dichalcogenide
  • É parte de: Physical review letters, 2018-07, Vol.121 (4)
  • Notas: Ministry of Science and Technology of China
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
    FG02-03ER46076; 2016YFA0301001; FG02-03-ER46076
  • Descrição: 1T-TaS2 is a cluster Mott insulator on the triangular lattice with 13 Ta atoms forming a star of David cluster as the unit cell. We derive a two-dimensional XXZ spin-1/2 model with a four-spin ring exchange term to describe the effective low energy physics of a monolayer 1T-TaS2, where the effective spin-1/2 degrees of freedom arises from the Kramers degenerate spin-orbital states on each star of David. Here, a large scale density matrix renormalization group simulation is further performed on this effective model and we find a gapless spin liquid phase with a spinon Fermi surface at a moderate to large strength region of the four-spin ring exchange term. All peaks in the static spin structure factor are found to be located on the “2kF” surface of a half-filled spinon on the triangular lattice. Experiments to detect the spinon Fermi surface phase in 1T-TaS2 are discussed.
  • Editor: United States: American Physical Society (APS)
  • Idioma: Inglês
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