Probing the mesoscopic size limit of quantum anomalous Hall insulators

Peng Deng (), Christopher Eckberg (), Peng Zhang, Gang Qiu, Eve Emmanouilidou, Gen Yin, Su Kong Chong, Lixuan Tai, Ni Ni and Kang L. Wang ()
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Peng Deng: University of California Los Angeles
Christopher Eckberg: Fibertek Inc
Peng Zhang: University of California Los Angeles
Gang Qiu: University of California Los Angeles
Eve Emmanouilidou: Department of Physics and Astronomy, University of California Los Angeles
Gen Yin: University of California Los Angeles
Su Kong Chong: University of California Los Angeles
Lixuan Tai: University of California Los Angeles
Ni Ni: Department of Physics and Astronomy, University of California Los Angeles
Kang L. Wang: University of California Los Angeles

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The inelastic scattering length (Ls) 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 Ls plays an instrumental role in determining transport properties. Here we examine Ls 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 Ls among all regimes. Finally, mesoscopic scaled devices with sizes on the order of Ls were fabricated, enabling the direct detection of the value of Ls in QAH samples. Our results unveil the fundamental length scale that governs the transport behavior of QAH materials.

Date: 2022
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DOI: 10.1038/s41467-022-31105-w

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