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Unprotected quadratic band crossing points and quantum anomalous Hall effect in FeB2 monolayer

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Abstract

Quadratic band crossing points (QBCPs) and quantum anomalous Hall effect (QAHE) have attracted the attention of both theoretical and experimental researchers in recent years. Based on first-principle calculations, we find that the FeB2 monolayer is a nonmagnetic semimetal with QBCPs at K. Through symmetry analysis and k · p invariant theory, we find that the QBCP is not protected by rotation symmetry and consists of two Dirac points with the same chirality (Berry phase of 2π). Once introducing Coulomb interactions, we find that there is a spontaneous-time-reversal-breaking instability of the spinful QBCPs, which gives rise to a C = 2 QAH insulator with orbital moment ordering.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

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

    DongYu Wu, YunPeng Huang, Song Sun, JiaCheng Gao, ZhaoPeng Guo, HongMing Weng, Zhong Fang, Kun Jiang & ZhiJun Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    DongYu Wu, Song Sun, JiaCheng Gao, HongMing Weng, Zhong Fang & ZhiJun Wang

Authors
  1. DongYu Wu
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  2. YunPeng Huang
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  3. Song Sun
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  4. JiaCheng Gao
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Corresponding authors

Correspondence to ZhaoPeng Guo or ZhiJun Wang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974395, 12188101, and U2032204), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), the China Postdoctoral Science Foundation funded project (Grant No. 2021M703461), and the Center for Materials Genome.

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The supporting information is available online at phys.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Wu, D., Huang, Y., Sun, S. et al. Unprotected quadratic band crossing points and quantum anomalous Hall effect in FeB2 monolayer. Sci. China Phys. Mech. Astron. 65, 256811 (2022). https://doi.org/10.1007/s11433-021-1862-3

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