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arXiv 2511.23218cond-mat.mes-hall
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具有破时间反演对称性的平坦带中的紧凑局域电流

Compact localized currents in flat bands with broken time-reversal symmetry

Institute for Basic Science(韩国基础科学研究院);Virginia Tech(弗吉尼亚理工大学);Consiglio Nazionale delle Ricerche(意大利国家研究委员会);Korea University of Science and Technology(韩国科学技术院);Massey University(梅西大学)

Rohit Kishan Ray, Carlo Danieli, Alexei Andreanov, Sergej Flach

AI总结:

本文提出了一种构建具有平坦带和破时间反演对称性的晶格模型的方法,通过磁通量穿入和单元变换生成支持局域电流的紧凑态。

摘要:

我们开发了一个系统框架,用于构建显式打破时间反演对称性(TRS)的全部带平坦(ABF)晶格哈密顿量。通过在不连通的多边形plaquette中穿入磁通量,并应用局部纠缠单元变换,我们将plaquette映射到一维、二维和三维中的ABF模型家族。此过程保持磁通量配置,将半解缠几何结构转换为具有非平凡跃迁结构的ABF晶格。所得到的平坦带允许紧凑局域态(CLSs),其支持包括穿磁通量的plaquette和由单元变换引入的辅助站点。在这些打破TRS的构造中,CLSs承载局部循环电流,其大小取决于所施加的磁通量。我们进一步将该框架扩展到具有共存的平坦和分散带的晶格中,展示了具有正交和非正交CLSs的案例。我们的结果提供了一种受控的方法,用于生成支持由磁通量诱导的局部电流的无散射晶格。

英文摘要:

We develop a systematic framework for constructing all-bands-flat (ABF) lattice Hamiltonians that explicitly break time-reversal symmetry (TRS). By threading magnetic flux through disconnected polygonal plaquettes and applying local entangling unitary transformations, we map plaquettes onto families of ABF models in one, two, and three dimensions. This procedure preserves the flux configuration while converting semi-detangled geometries into ABF lattices with nontrivial hopping structure. The resulting flat bands admit compact localized states (CLSs) whose support includes both the flux-threaded plaquettes and auxiliary sites introduced by the unitary transformations. In these TRS-broken constructions, the CLSs host localized circulatory currents whose magnitude depends on the applied flux. We further extend the framework to lattices with coexisting flat and dispersive bands, illustrating cases with both orthogonal and non-orthogonal CLSs. Our results provide a controlled route for generating dispersionless lattices supporting flux-induced local currents.

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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