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arXiv 1206.3759cond-mat.str-elhep-thmath-phmath.MPquant-ph
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高Chern数拓扑平带中的分数Chern绝缘体

Fractional Chern Insulators in Topological Flat bands with Higher Chern Number

Zhao Liu, Emil J. Bergholtz, Heng Fan, Andreas M. Laeuchli

摘要:

晶格模型形成带具有较高的陈数提供了一个有趣的可能性,新的相位的物质没有类似的连续朗道水平。在这里,我们建立了一些新的体绝缘状态的存在,在分数填充的平带与陈数$C=N>1$,形成在最近提出的烧绿石模型与强自旋轨道耦合。特别是,我们发现了令人信服的证据,一系列的稳定状态在$ν=1/(2N+1)$的费米子以及玻色子状态在$ν=1/(N+1)$。通过研究拓扑基态简并度、激发结构和纠缠谱,我们得出这些态是阿贝尔态的结论。我们还明确地表明,这些状态,但由于底层的能带结构的新特性定性不同于传统的量子霍尔(多层)状态。

英文摘要:

Lattice models forming bands with higher Chern number offer an intriguing possibility for new phases of matter with no analogue in continuum Landau levels. Here, we establish the existence of a number of new bulk insulating states at fractional filling in flat bands with Chern number $C=N>1$, forming in a recently proposed pyrochlore model with strong spin-orbit coupling. In particular, we find compelling evidence for a series of stable states at $ν=1/(2N+1)$ for fermions as well as bosonic states at $ν=1/(N+1)$. By examining the topological ground state degeneracies and the excitation structure as well as the entanglement spectrum, we conclude that these states are Abelian. We also explicitly demonstrate that these states are nevertheless qualitatively different from conventional quantum Hall (multilayer) states due to the novel properties of the underlying band structure.

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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