Light-Induced Type-II Band Inversion and Quantum Anomalous Hall State in Monolayer FeSe

Physical Review Letters
Z F WangFeng Liu

Abstract

Coupling a quantum anomalous Hall (QAH) state with a superconducting state offers an attractive approach to detect the signature alluding to a topological superconducting state [Q. L. He et al., Science 357, 294 (2017)SCIEAS0036-807510.1126/science.aag2792], but its explanation could be clouded by disorder effects in magnetic doped QAH materials. On the other hand, an antiferromagnetic (AFM) quantum spin Hall (QSH) state is identified in the well-known high-temperature 2D superconductor of monolayer FeSe [Z. F. Wang et al., Nat. Mater. 15, 968 (2016)NMAACR1476-112210.1038/nmat4686]. Here, we report a light-induced type-II band inversion (BI) and a QSH-to-QAH phase transition in the monolayer FeSe. Depending on the handedness of light, a spin-tunable QAH state with a high Chern number of ±2 is realized. In contrast to the conventional type-I BI resulting from intrinsic spin-orbital coupling (SOC), which inverts the band an odd number of times and respects time reversal symmetry, the type-II BI results from a light-induced handedness-dependent effective SOC, which inverts the band an even number of times and does not respect time reversal symmetry. The interplay between these two SOC terms makes the spin-up and -down bands of an ...Continue Reading

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Citations

Apr 15, 2020·Physical Chemistry Chemical Physics : PCCP·Xiaodong LvZhongfang Chen
Oct 22, 2019·Physical Review Letters·Z F WangWei Zhu
Jan 27, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jian LiuMingwen Zhao
Jul 14, 2020·Nano Letters·Gan ZhaoZhengfei Wang
Aug 9, 2019·Nano Letters·Bing LiuZ F Wang

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