Deng Peng, Eckberg Christopher, Zhang Peng, Qiu Gang, Emmanouilidou Eve, Yin Gen, Chong Su Kong, Tai Lixuan, Ni Ni, Wang Kang L
Department of Electrical and Computer Engineering, University of California Los Angeles, Los Angeles, CA, USA.
Fibertek Inc, Herndon, VA, USA.
Nat Commun. 2022 Jul 22;13(1):4246. doi: 10.1038/s41467-022-31105-w.
The inelastic scattering length (L) is a length scale of fundamental importance in condensed matters due to the relationship between inelastic scattering and quantum dephasing. In quantum anomalous Hall (QAH) materials, the mesoscopic length scale L plays an instrumental role in determining transport properties. Here we examine L in three regimes of the QAH system with distinct transport behaviors: the QAH, quantum critical, and insulating regimes. Although the resistance changes by five orders of magnitude when tuning between these distinct electronic phases, scaling analyses indicate a universal L among all regimes. Finally, mesoscopic scaled devices with sizes on the order of L were fabricated, enabling the direct detection of the value of L in QAH samples. Our results unveil the fundamental length scale that governs the transport behavior of QAH materials.
由于非弹性散射与量子退相干之间的关系，非弹性散射长度（L）是凝聚态物质中具有根本重要性的长度尺度。在量子反常霍尔（QAH）材料中，介观长度尺度L在确定输运性质方面起着重要作用。在这里，我们在具有不同输运行为的QAH系统的三种状态下研究L：QAH态、量子临界态和绝缘态。尽管在这些不同的电子相之间调谐时电阻变化了五个数量级，但标度分析表明所有状态下都存在一个通用的L。最后，制造了尺寸约为L的介观标度器件，能够直接检测QAH样品中L的值。我们的结果揭示了支配QAH材料输运行为的基本长度尺度。
