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Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4 | | Dmitry Ovchinnikov
; Xiong Huang
; Zhong Lin
; Zaiyao Fei
; Jiaqi Cai
; Tiancheng Song
; Minhao He
; Qianni Jiang
; Chong Wang
; Hao Li
; Yayu Wang
; Yang Wu
; Di Xiao
; Jiun-Haw Chu
; Jiaqiang Yan
; Cui-Zu Chang
; Yong-Tao Cui
; Xiaodong Xu
; | | Date: |
1 Nov 2020 | | Abstract: | The interplay between band topology and magnetic order plays a key role in
quantum states of matter. MnBi2Te4, a van der Waals magnet, has recently
emerged as an exciting platform for exploring Chern insulator physics. Its
layered antiferromagnetic order was predicted to enable even-odd layer-number
dependent topological states, supported by promising edge transport
measurements. Furthermore, it becomes a Chern insulator when all spins are
aligned by an applied magnetic field. However, the evolution of the bulk
electronic structure as the magnetic state is continuously tuned and its
dependence on layer number remains unexplored. Here, employing multimodal
probes, we establish one-to-one correspondence between bulk electronic
structure, magnetic state, topological order, and layer thickness in atomically
thin MnBi2Te4 devices. As the magnetic state is tuned through the canted
magnetic phase, we observe a band crossing, i.e., the closing and reopening of
the bulk bandgap, corresponding to the concurrent topological phase transition.
Surprisingly, we find that the even- and odd-layer number devices exhibit a
similar topological phase transition coupled to magnetic states, distinct from
recent theoretical and experimental reports. Our findings shed new light on the
interplay between band topology and magnetic order in this newly discovered
topological magnet and validate the band crossing with concurrent measurements
of topological invariant in a continuously tuned topological phase transition. | | Source: | arXiv, 2011.00555 | | Services: | Forum | Review | PDF | Favorites | |
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