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Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2

Author

Listed:
  • Kenan Zhang

    (State Key Laboratory of Low Dimensional Quantum Physics)

  • Changhua Bao

    (State Key Laboratory of Low Dimensional Quantum Physics)

  • Qiangqiang Gu

    (International Center for Quantum Materials, School of Physics, Peking University)

  • Xiao Ren

    (International Center for Quantum Materials, School of Physics, Peking University)

  • Haoxiong Zhang

    (State Key Laboratory of Low Dimensional Quantum Physics)

  • Ke Deng

    (State Key Laboratory of Low Dimensional Quantum Physics)

  • Yang Wu

    (State Key Laboratory of Low Dimensional Quantum Physics
    Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University)

  • Yuan Li

    (International Center for Quantum Materials, School of Physics, Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Ji Feng

    (International Center for Quantum Materials, School of Physics, Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Shuyun Zhou

    (State Key Laboratory of Low Dimensional Quantum Physics
    Collaborative Innovation Center of Quantum Matter)

Abstract

Transition metal dichalcogenide MoTe2 is an important candidate for realizing the newly predicted type-II Weyl fermions, for which the breaking of the inversion symmetry is a prerequisite. Here we present direct spectroscopic evidence for the inversion symmetry breaking in the low-temperature phase of MoTe2 by systematic Raman experiments and first-principles calculations. We identify five lattice vibrational modes that are Raman-active only in the low-temperature noncentrosymmetric structure. A hysteresis is also observed in the peak intensity of inversion symmetry-activated Raman modes, confirming a temperature-induced structural phase transition with a concomitant change in the inversion symmetry. Our results provide definitive evidence for the low-temperature noncentrosymmetric Td phase from vibrational spectroscopy, and suggest MoTe2 as an ideal candidate for investigating the temperature-induced topological phase transition.

Suggested Citation

  • Kenan Zhang & Changhua Bao & Qiangqiang Gu & Xiao Ren & Haoxiong Zhang & Ke Deng & Yang Wu & Yuan Li & Ji Feng & Shuyun Zhou, 2016. "Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13552
    DOI: 10.1038/ncomms13552
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    Cited by:

    1. Wei Qin & Wajid Ali & Jianfeng Wang & Yong Liu & Xiaolan Yan & Pengfei Zhang & Zhaochi Feng & Hao Tian & Yanfeng Yin & Wenming Tian & Can Li, 2023. "Suppressing non-radiative recombination in metal halide perovskite solar cells by synergistic effect of ferroelasticity," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. James L. Hart & Lopa Bhatt & Yanbing Zhu & Myung-Geun Han & Elisabeth Bianco & Shunran Li & David J. Hynek & John A. Schneeloch & Yu Tao & Despina Louca & Peijun Guo & Yimei Zhu & Felipe Jornada & Eva, 2023. "Emergent layer stacking arrangements in c-axis confined MoTe2," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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