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The discovery of three-dimensional Van Hove singularity

Author

Listed:
  • Wenbin Wu

    (East China Normal University
    East China Normal University
    East China Normal University)

  • Zeping Shi

    (East China Normal University)

  • Mykhaylo Ozerov

    (Florida State University)

  • Yuhan Du

    (East China Normal University)

  • Yuxiang Wang

    (Fudan University)

  • Xiao-Sheng Ni

    (Sun Yat-Sen University)

  • Xianghao Meng

    (East China Normal University)

  • Xiangyu Jiang

    (East China Normal University)

  • Guangyi Wang

    (East China Normal University)

  • Congming Hao

    (East China Normal University)

  • Xinyi Wang

    (East China Normal University)

  • Pengcheng Zhang

    (East China Normal University)

  • Chunhui Pan

    (East China Normal University)

  • Haifeng Pan

    (East China Normal University)

  • Zhenrong Sun

    (East China Normal University)

  • Run Yang

    (Southeast University)

  • Yang Xu

    (East China Normal University)

  • Yusheng Hou

    (Sun Yat-Sen University)

  • Zhongbo Yan

    (Sun Yat-Sen University)

  • Cheng Zhang

    (Fudan University
    Fudan University)

  • Hai-Zhou Lu

    (Southern University of Science and Technology (SUSTech))

  • Junhao Chu

    (East China Normal University
    Fudan University)

  • Xiang Yuan

    (East China Normal University
    East China Normal University
    East China Normal University)

Abstract

Arising from the extreme/saddle point in electronic bands, Van Hove singularity (VHS) manifests divergent density of states (DOS) and induces various new states of matter such as unconventional superconductivity. VHS is believed to exist in one and two dimensions, but rarely found in three dimension (3D). Here, we report the discovery of 3D VHS in a topological magnet EuCd2As2 by magneto-infrared spectroscopy. External magnetic fields effectively control the exchange interaction in EuCd2As2, and shift 3D Weyl bands continuously, leading to the modification of Fermi velocity and energy dispersion. Above the critical field, the 3D VHS forms and is evidenced by the abrupt emergence of inter-band transitions, which can be quantitatively described by the minimal model of Weyl semimetals. Three additional optical transitions are further predicted theoretically and verified in magneto-near-infrared spectra. Our results pave the way to exploring VHS in 3D systems and uncovering the coordination between electronic correlation and the topological phase.

Suggested Citation

  • Wenbin Wu & Zeping Shi & Mykhaylo Ozerov & Yuhan Du & Yuxiang Wang & Xiao-Sheng Ni & Xianghao Meng & Xiangyu Jiang & Guangyi Wang & Congming Hao & Xinyi Wang & Pengcheng Zhang & Chunhui Pan & Haifeng , 2024. "The discovery of three-dimensional Van Hove singularity," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46626-9
    DOI: 10.1038/s41467-024-46626-9
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