期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.046401
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资金
- HKRGC [KUST3/CRF/13G, C6026-16W]
- Hong Kong PhD Fellowship
- Ministry of Science and Technology of China [2016YFA0301001]
- Thousand-Youth-Talent Program of China
- Croucher Foundation
- Dr Tai-chin Lo Foundation
- U.S. Department of Energy, Basic Energy Sciences [DE-FG02-03-ER46076]
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(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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