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Observation of the zero Hall plateau in a quantum anomalous Hall insulator | | Yang Feng
; Xiao Feng
; Yunbo Ou
; Jing Wang
; Chang Liu
; Liguo Zhang
; Dongyang Zhao
; Gaoyuan Jiang
; Shou-Cheng Zhang
; Ke He
; Xucun Ma
; Qi-Kun Xue
; Yayu Wang
; | | Date: |
16 Mar 2015 | | Abstract: | Quantum anomalous Hall (QAH) effect in magnetic topological insulator (TI) is
a novel transport phenomenon in which the Hall resistance reaches the quantum
plateau in the absence of external magnetic field. Recently, this exotic effect
has been discovered experimentally in an ultrathin film of the Bi2Te3 family TI
with spontaneous ferromagnetic (FM) order. An important question concerning the
QAH state is whether it is simply a zero-magnetic-field version of the quantum
Hall (QH) effect, or if there is new physics beyond the conventional paradigm.
Here we report experimental investigations on the quantum phase transition
between the two opposite Hall plateaus of a QAH insulator caused by
magnetization reversal. We observe a well-defined plateau with zero Hall
conductivity over a range of magnetic field around coercivity, consistent with
a recent theoretical prediction. The features of the zero Hall plateau are
shown to be closely related to that of the QAH effect, but its temperature
evolution exhibits quantitative differences from the network model for
conventional QH plateau transition. We propose that the chiral edge states
residing at the magnetic domain boundaries, which are unique to a QAH
insulator, are responsible for the zero Hall plateau. The rich magnetic domain
dynamics makes the QAH effect a distinctive class of quantum phenomenon that
may find novel applications in spintronics. | | Source: | arXiv, 1503.4569 | | Services: | Forum | Review | PDF | Favorites | |
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