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arXiv 1703.08006cond-mat.str-elmath-phmath.MP
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理想分数Chern绝缘体的能带结构工程

Band structure engineering of ideal fractional Chern insulators

Ching Hua Lee, Martin Claassen, Ronny Thomale

摘要:

作为分数量子霍尔系统的晶格类似物,分数陈氏绝缘体(FCI)表现出神秘的物理性质,这是由于单体和多体物理之间复杂的相互作用。特别是,理想的陈能带结构的设计作为主机FCIs需要联合考虑的能量,拓扑结构和量子几何的陈带。我们设计了一个分析优化方案,生成原型FCI模型满足标准的带平坦度,均匀的Berry曲率,和各向同性的量子几何。这是通过采用一个全纯坐标表示的布洛赫状态跨越的基础上的陈氏带。所得到的FCI模型不仅表现出广泛的可调性,尽管只有很少的可调参数,但也服从分析控制截断方案,以适应任何所需的约束最大跳跃范围或密度-密度相互作用项。总之,我们的方法提供了一个起点,工程理想的FCI模型是强大的,在面对的规格所施加的分析,数值,或实验实施。

英文摘要:

As lattice analogs of fractional quantum Hall systems, fractional Chern insulators (FCIs) exhibit enigmatic physical properties resulting from the intricate interplay between single-body and many-body physics. In particular, the design of ideal Chern band structures as hosts for FCIs necessitates the joint consideration of energy, topology, and quantum geometry of the Chern band. We devise an analytical optimization scheme that generates prototypical FCI models satisfying the criteria of band flatness, homogeneous Berry curvature, and isotropic quantum geometry. This is accomplished by adopting a holomorphic coordinate representation of the Bloch states spanning the basis of the Chern band. The resultant FCI models not only exhibit extensive tunability despite having only few adjustable parameters, but are also amenable to analytically controlled truncation schemes to accommodate any desired constraint on the maximum hopping range or density-density interaction terms. Together, our approach provides a starting point for engineering ideal FCI models that are robust in the face of specifications imposed by analytical, numerical, or experimental implementation.

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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