Fractional quantum Hall effect in topological flat bands with Chern number two

Fractional quantum Hall effect in topological flat bands with Chern number two
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陈二数拓扑平带中的分数量子霍尔效应

DOI:
10.1103/physrevb.86.201101
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发表时间:
2012-04
期刊:
影响因子:
3.7
通讯作者:
Sheng, D. N.
Sheng, D. N.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang, Yi-Fei;Yao, Hong;Gong, Chang-De;Sheng, D. N.

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最近的理论工作已经证明了各种强大的阿贝尔和非阿贝尔分数拓扑相位在晶格模型与拓扑平坦带携带陈数C = 1。本文研究了三带三角晶格模型中的硬核玻色子和相互作用费米子,其中最低拓扑平带为陈数C = 2。我们发现了令人信服的数值证据玻色子分数量子霍尔效应在1/3填充的特点是三倍的准环上的基态,一个分数陈数为每个基态,一个强大的光谱间隙,并在准空穴激发谱的间隙。我们还观察到了一个强大的费米分数量子霍尔效应的数值证据,在1/5填充短程相互作用的无自旋费米子。
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 � = 1/3 filling characterized by three-fold 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 � = 1/5 filling with short-range interactions.
DOI: 10.1017/cbo9781139207249.009
发表时间: 2012
期刊: --
影响因子: --
作者:
W. Marsden
通讯作者: W. Marsden
DOI: 10.1093/acprof:oso/9780199227259.001.0001
发表时间: 2004-08
期刊: Thermal Science
影响因子: 1.7
作者:
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通讯作者: X. Wen
DOI: 10.1063/1.2155760
发表时间: 2005-11
期刊: Physics Today
影响因子: 3.5
作者:
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通讯作者: M. Fisher