Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS₂
Name
PhysRevLett.121.046401.pdf
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317.35 KB
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Checksum (MD5)
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Author(s)
He, Wen-Yu
Xu, Xiao Yan
Chen, Gang
Law, K. T.
Lee, Patrick A
Date Issued
July 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
He, Wen-Yu et al. "Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS₂." Physical Review Letters 121, 4 (July 2018): 046401 © 2018 American Physical Society
Version
Final published version
Abstract
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. 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[subscript F]” surface of a half-filled spinon on the triangular lattice. Experiments to detect the spinon Fermi surface phase in 1T−TaS₂ are discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.046401
