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Multiple Dirac points including potential spin-orbit Dirac points in nonsymmorphic HfGe0.92Te

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Abstract

The search for new materials with Dirac points has been a fascinating subject of condensed matter physics. Here we first report the growth and band structure of HfGe0.92Te single crystals featuring three different types of Dirac points. HfGe0.92Te crystallizes in a nonsymmorphic tetragonal space group P4/nmm (No. 129), having a square Ge-atom plane with vacancies of about 8%. Using angle-resolved photoemission spectroscopy (ARPES), the Dirac nodal line composed of conventional Dirac points vulnerable to spin-orbit coupling (SOC) is observed, accompanied by robust Dirac points protected by the nonsymmorphic symmetry against SOC and vacancies. In particular, spin-orbit Dirac points (SDPs) originating from the surface formed under significant SOC could exist based on ARPES and calculations. Quasi-two-dimensional (quasi-2D) characteristics are confirmed by angular-resolved magnetoresistance. HfGe0.92Te bulk crystals can be easily exfoliated to flakes with a thickness of approximately 5 nm for the quasi-2D nature. Thus, HfGe0.92Te provides a good platform to explore exotic topological phases or topological properties with three different types of Dirac points, which is a potential candidate to achieve novel 2D SDPs.

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  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

    Long Chen, Liqin Zhou, Ying Zhou, Ke Liao, Shunye Gao, Wenhui Fan, Tian Qian, Hongming Weng & Gang Wang

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

    Long Chen, Liqin Zhou, Ying Zhou, Ke Liao, Shunye Gao, Wenhui Fan, Jinfeng Xu, Yuxuan Guo, Tian Qian, Hongming Weng & Gang Wang

  3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Chen Liu, Jinfeng Xu, Yuxuan Guo & Jia’ou Wang

  4. Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Zhongnan Guo

  5. Songshan Lake Materials Laboratory, Dongguan, 523808, China

    Tian Qian, Hongming Weng & Gang Wang

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  1. Long Chen
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Corresponding authors

Correspondence to Chen Liu, Jia’ou Wang, Hongming Weng or Gang Wang.

Additional information

This work was partially supported by the National Natural Science Foundation of China (Grant Nos. 51832010, 51902055, 11925408, 12005251, and 11921004), and National Key Research and Development Program of China (Grant Nos. 2018YFE0202602, 2018YFA0305700, and 2017YFA0302902). L. Chen and G. Wang would like to thank professor X. L. Chen from the Institute of Physics, Chinese Academy of Sciences, for useful discussions.

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Chen, L., Zhou, L., Zhou, Y. et al. Multiple Dirac points including potential spin-orbit Dirac points in nonsymmorphic HfGe0.92Te. Sci. China Phys. Mech. Astron. 66, 217011 (2023). https://doi.org/10.1007/s11433-022-1992-x

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