arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.09565cond-mat.str-elcond-mat.mes-hallcond-mat.quant-gas
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具有非朗道能级连续极限的分数阶Chern绝缘子

Fractional Chern insulators with a non-Landau level continuum limit

David Bauer, Spenser Talkington, Fenner Harper, Bartholomew Andrews, Rahul Roy

摘要:

分数量子霍尔(Fractional quantum Hall,简称FQH)物理学的最新发展强调了研究部分占据非朗道能级能带的粒子的FQH相的重要性。在强晶格效应的范围内,被称为分数Chern绝缘体的H-H相为此类研究提供了一种设置。当晶格效应的强度消失时,一般晶格模型的能带渐近地接近朗道能级。在这篇文章中,我们构建晶格模型的单粒子带是不同的朗道水平,即使在这个连续极限。我们描述了如何区分这样的频带和朗道水平是量化的频带几何形状的磁布里渊区和反映在电磁响应。我们分析了一个这样的模型中的定域-离域转变,并计算出定域长度指数为2.57(3)。此外,我们研究相互作用投影到这些频带,并发现签名的玻色子和费米子劳克林状态。最相关的是,我们的模型使我们能够隔离最佳能带几何形状的条件,并进一步了解晶格上的HzH相的稳定性。

英文摘要:

Recent developments in fractional quantum Hall (FQH) physics highlight the importance of studying FQH phases of particles partially occupying energy bands that are not Landau levels. FQH phases in the regime of strong lattice effects, called fractional Chern insulators, provide one setting for such studies. As the strength of lattice effects vanishes, the bands of generic lattice models asymptotically approach Landau levels. In this article, we construct lattice models for single-particle bands that are distinct from Landau levels even in this continuum limit. We describe how the distinction between such bands and Landau levels is quantified by band geometry over the magnetic Brillouin zone and reflected in the electromagnetic response. We analyze the localization-delocalization transition in one such model and compute a localization length exponent of 2.57(3). Moreover, we study interactions projected to these bands and find signatures of bosonic and fermionic Laughlin states. Most pertinently, our models allow us to isolate conditions for optimal band geometry and gain further insight into the stability of FQH phases on lattices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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