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Correlation-driven threefold topological phase transition in monolayer OsBr2

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Abstract

Spin—orbit coupling (SOC) combined with electronic correlation can induce topological phase transition, producing novel electronic states. Here, we investigate the impact of SOC combined with correlation effects on physical properties of monolayer OsBr2, based on first-principles calculations with generalized gradient approximation plus U (GGA+U) approach. With intrinsic out-of-plane magnetic anisotropy, OsBr2 undergoes threefold topological phase transition with increasing U, and valley-polarized quantum anomalous Hall insulator (VQAHI) to half-valley-metal (HVM) to ferrovalley insulator (FVI) to HVM to VQAHI to HVM to FVI transitions can be induced. These topological phase transitions are connected with sign-reversible Berry curvature and band inversion between \({d_{xy}}/{d_{{x^2} - {y^2}}}\) and \({d_{{z^2}}}\) orbitals. Due to \(\bar 6m2\) symmetry, piezoelectric polarization of OsBr2 is confined along the in-plane armchair direction, and only one d11 is independent. For a given material, the correlation strength should be fixed, and OsBr2 may be a piezoelectric VQAHI (PVQAHI), piezoelectric HVM (PHVM) or piezoelectric FVI (PFVI). The valley polarization can be flipped by reversing the magnetization of Os atoms, and the ferrovalley (FV) and nontrivial topological properties will be suppressed by manipulating out-of-plane magnetization to in-plane one. In considered reasonable U range, the estimated Curie temperatures all are higher than room temperature. Our findings provide a comprehensive understanding on possible electronic states of OsBr2, and confirm that strong SOC combined with electronic correlation can induce multiple quantum phase transition.

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Acknowledgements

This work was supported by the Natural Science Basis Research Plan in Shaanxi Province of China (No. 2021JM-456), Graduate Innovation Fund Project in Xi’an University of Posts and Telecommunications (No. CXJJDL2021001), the National Natural Science Foundation of China (Grant No. 11974393) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33020100). We are grateful to Shaanxi Supercomputing Center of China, and the calculations were performed on TianHe-2.

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Authors and Affiliations

  1. School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an, 710121, China

    San-Dong Guo, Yu-Ling Tao & Wen-Qi Mu

  2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Bang-Gui Liu

  3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China

    Bang-Gui Liu

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  1. San-Dong Guo
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Correspondence to San-Dong Guo.

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Guo, SD., Tao, YL., Mu, WQ. et al. Correlation-driven threefold topological phase transition in monolayer OsBr2. Front. Phys. 18, 33304 (2023). https://doi.org/10.1007/s11467-022-1243-5

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