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arXiv 2505.03485cond-mat.mes-hall
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具有空间不相关散射的鲁棒量子异常霍尔效应

Robust quantum anomalous Hall effect with spatially uncorrelated disorder

Imec;Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich(于利希研究中心彼得·格林伯格研究所(PGI-9));JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University(亚琛-于利希研究联盟JARA未来信息技术基础,于利希研究中心和亚琛工业大学);Department of Physics, Georgetown University(乔治城大学物理系)

Kristof Moors, Gen Yin

AI总结:

研究显示,在存在空间不相关散射的情况下,磁性拓扑绝缘体中的量子异常霍尔效应表现出高度鲁棒性,其原因在于量子限制效应。

摘要:

在磁性拓扑绝缘体中,通过旋转外加磁场可以触发量子异常霍尔(QAH)相与安德森局域化相之间的相变。在没有沿磁域的散射路径的情况下,这一相变由非磁性散射引起。我们证明,在存在空间不相关散射的情况下,QAH相表现出惊人的鲁棒性。这种鲁棒性归因于由散射相关长度短所引起的量子限制。相变附近临界行为表明了一种与量子渗流不同的图景。这为磁性拓扑绝缘体中存在原子缺陷、杂质和掺杂的QAH效应的鲁棒性提供了新的见解。

英文摘要:

In magnetic topological insulators, a phase transition between a quantum anomalous Hall (QAH) and an Anderson localization phase can be triggered by the rotation of an applied magnetic field. Without the scattering paths along magnetic domains, this phase transition is governed by scattering induced by nonmagnetic disorder. We show that the QAH phase is strikingly robust in the presence of spatially uncorrelated disorder. The robustness is attributed to the quantum confinement induced by the short correlation length of the disorder. The critical behavior near the phase transition suggests a picture distinct from quantum percolation. This provides new insights on the robustness of the QAH effect in magnetic topological insulators with atomic defects, impurities, and dopants.

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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