Fig. 1: QAH, quantum critical, and insulating regimes of QAH.
From: Probing the mesoscopic size limit of quantum anomalous Hall insulators
a, b Magnetic field dependence of σxy and ρxx measured at 50 mK. Upon field sweeping, the QAH system can be tuned into the QAH, quantum critical, or insulating regime. c Plot of σxx as a function of σxy. A semicircle relationship is shown during the transition. d Temperature dependence of ρxx under different B*, where \({B}^{* }=B-{\mu }_{0}{H}_{c}\) and Hc is the coercive field, exhibiting a magnetization driven metal-insulator transition at \({B}^{* }={B}_{c}^{* }\) (dashed green line) with a critical resistance of ~h/e2.
