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18 April 2024 |
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Confinement-Induced Chiral Edge Channel Interaction in Quantum Anomalous Hall Insulators | | Ling-Jie Zhou
; Ruobing Mei
; Yi-Fan Zhao
; Ruoxi Zhang
; Deyi Zhuo
; Zi-Jie Yan
; Wei Yuan
; Morteza Kayyalha
; Moses H. W. Chan
; Chao-Xing Liu
; Cui-Zu Chang
; | | Date: |
18 Jul 2022 | | Abstract: | In quantum anomalous Hall (QAH) insulators, the interior is insulating but
electrons can travel with zero resistance along one-dimensional conducting
paths known as chiral edge channels (CECs). These CECs have been predicted to
be confined to the one-dimensional (1D) edges and exponentially decay in the
two-dimensional (2D) bulk. In this work, we present the results of a systematic
study of QAH devices fashioned in a Hall bar geometry of different widths. At
the charge neutral point, the QAH effect persists in a Hall bar device with a
width of only ~72 nm, implying the intrinsic decaying length of CECs is less
than ~36 nm. In the electron-doped regime, we find that the Hall resistance
deviates quickly from the quantized value when the sample width is less than 1
um. Our theoretical calculations suggest that the deviation from the quantized
Hall resistance in narrow QAH samples originates from the interaction between
two opposite CECs mediated by disorder-induced bulk states in QAH insulators,
consistent with our experimental observations. | | Source: | arXiv, 2207.08371 | | Services: | Forum | Review | PDF | Favorites | |
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