期刊
PHYSICAL REVIEW B
卷 86, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.201101
关键词
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资金
- NSFC of China [10904130]
- Tsinghua Startup Funds
- US NSF [DMR-0904264]
- US DOE Office of Basic Energy Sciences [DE-FG02-06ER46305]
- State Key Program for Basic Research of China [2006CB921802, 2009CB929504]
Recent theoretical works have demonstrated various robust Abelian and non-Abelian fractional topological phases in lattice models with topological flat bands carrying Chern number C = 1. Here we study hard-core bosons and interacting fermions in a three-band triangular-lattice model with the lowest topological flat band of Chern number C = 2. We find convincing numerical evidence of bosonic fractional quantum Hall effect at the nu = 1/3 filling characterized by threefold quasidegeneracy of ground states on a torus, a fractional Chern number for each ground state, a robust spectrum gap, and a gap in quasihole excitation spectrum. We also observe numerical evidence of a robust fermionic fractional quantum Hall effect for spinless fermions at the nu = 1/5 filling with short-range interactions.
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