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Quantum phase transition from axion insulator to Chern insulator in MnBi2Te4 | | Chang Liu
; Yongchao Wang
; Hao Li
; Yang Wu
; Yaoxin Li
; Jiaheng Li
; Ke He
; Yong Xu
; Jinsong Zhang
; Yayu Wang
; | | Date: |
2 May 2019 | | Abstract: | Finding novel topological quantum matter and topological phase transitions
has been a central theme in modern physics. An outstanding example is the Chern
insulator, first conceived as a theoretical model for the quantum Hall effect
without Landau levels, which was realized experimentally in magnetically doped
topological insulator (TI) at zero magnetic field, known as the quantum
anomalous Hall (QAH) effect. The axion insulator is another distinct
topological phase that has vanishing Chern number but a finite topological
Chern-Simon term. It was proposed to be a promising platform for exploring
quantized topological magnetoelectric coupling and axion electrodynamics in
condensed matter. Previous attempts to construct the axion insulator phase
involve heterostructures of two QAH layers with different coercive fields,
which require complex epitaxial growth and ultralow temperature measurement in
finite magnetic field. Here we report the realization of an intrinsic axion
insulator phase in MnBi2Te4, which has been predicted to be a TI with
interlayer antiferromagnetic (AFM) order. We found that when the crystal is
exfoliated down to 6 septuple layers (SLs) and tuned into the insulating
regime, the axion insulator phase is observed at zero magnetic field when the
top and bottom surfaces are subjected to opposite magnetization. More
interestingly, a moderate magnetic field drives a transition from the axion
insulator phase, characterized by large longitudinal resistance and zero Hall
resistance, to a Chern insulator with zero longitudinal resistance and
quantized Hall resistance h/e2 (h is the Plank constant and e is the elemental
charge). The robust and tunable axion insulator and Chern insulator phases
hosted by one stoichiometric crystal at relatively high temperature makes it a
versatile system for investigating exotic topological phases and phase
transitions. | | Source: | arXiv, 1905.0715 | | Services: | Forum | Review | PDF | Favorites | |
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