Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS₂
Author(s)
He, Wen-Yu; Xu, Xiao Yan; Chen, Gang; Law, K. T.; Lee, Patrick A
DownloadPhysRevLett.121.046401.pdf (317.3Kb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
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.
Date issued
2018-07Department
Massachusetts Institute of Technology. Department of PhysicsJournal
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
ISSN
0031-9007
1079-7114