title: Fractional quantum Hall effect of hard-core bosons in topological flat bands.
abstract: Recent proposals of topological flat band models have provided a new route to realize the fractional quantum Hall effect without Landau levels. We study hard-core bosons with short-range interactions in two representative topological flat band models, one of which is the well-known Haldane model (but with different parameters). We demonstrate that fractional quantum Hall states emerge with signatures of an even number of quasidegenerate ground states on a torus and a robust spectrum gap separating these states from the higher energy spectrum. We also establish quantum phase diagrams for the filling factor 1/2 and illustrate quantum phase transitions to other competing symmetry-breaking phases.
authors: Center for Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004, China.
authors: Yi-Fei
authors: YF
authors: Wang
authors: Zheng-Cheng
authors: ZC
authors: Gu
authors: Chang-De
authors: CD
authors: Gong
authors: D N
authors: DN
authors: Sheng