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.

doi:10.1103/physrevlett.121.046401

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

Journal Article · Tue Jul 24 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.121.046401· OSTI ID:1777863

He, Wen-Yu ^[1]; Xu, Xiao Yan ^[1]; Chen, Gang ^[2]; Law, K. T. ^[1]; Lee, Patrick A. ^[3]

Hong Kong Univ. of Science and Technology (China)
Fudan Univ., Shanghai (China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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 “2k_F” surface of a half-filled spinon on the triangular lattice. Experiments to detect the spinon Fermi surface phase in 1T-TaS₂ are discussed.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Science and Technology of China

Grant/Contract Number:: FG02-03ER46076; 2016YFA0301001; FG02-03-ER46076

OSTI ID:: 1777863

Alternate ID(s):: OSTI ID: 1461577

Journal Information:: Physical Review Letters, Vol. 121, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 46 works

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