中国物理B ›› 2025, Vol. 34 ›› Issue (1): 17301-017301.doi: 10.1088/1674-1056/ad8eca

• • 上一篇    

Chiral phonons of honeycomb-type bilayer Wigner crystals

Dingrui Yang(杨丁睿)1, Lingyi Li(李令仪)2, Na Zhang(张娜)3, and Hongyi Yu(俞弘毅)3,4,†   

  1. 1 Keble College, University of Oxford, Oxford, United Kingdom;
    2 Samueli School of Engineering, University of California, Irvine, CA 92697, USA;
    3 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China;
    4 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University (Guangzhou Campus), Guangzhou 510275, China
  • 收稿日期:2024-09-29 修回日期:2024-11-01 接受日期:2024-11-05 发布日期:2024-12-06
  • 通讯作者: Hongyi Yu E-mail:yuhy33@mail.sysu.edu.cn
  • 基金资助:
    This work was supported by Tencent’s Program of Aspiring Explorers in Science. H.Y. acknowledges support by the National Natural Science Foundation of China (Grant No. 12274477) and the Department of Science and Technology of Guangdong Province in China (Grant No. 2019QN01X061).

Chiral phonons of honeycomb-type bilayer Wigner crystals

Dingrui Yang(杨丁睿)1, Lingyi Li(李令仪)2, Na Zhang(张娜)3, and Hongyi Yu(俞弘毅)3,4,†   

  1. 1 Keble College, University of Oxford, Oxford, United Kingdom;
    2 Samueli School of Engineering, University of California, Irvine, CA 92697, USA;
    3 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China;
    4 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University (Guangzhou Campus), Guangzhou 510275, China
  • Received:2024-09-29 Revised:2024-11-01 Accepted:2024-11-05 Published:2024-12-06
  • Contact: Hongyi Yu E-mail:yuhy33@mail.sysu.edu.cn
  • Supported by:
    This work was supported by Tencent’s Program of Aspiring Explorers in Science. H.Y. acknowledges support by the National Natural Science Foundation of China (Grant No. 12274477) and the Department of Science and Technology of Guangdong Province in China (Grant No. 2019QN01X061).

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摘要： We theoretically investigated the chiral phonons of honeycomb-type bilayer Wigner crystals recently discovered in van der Waals structures of layered transition metal dichalcogenides. These chiral phonons can emerge under the inversion symmetry breaking introduced by an effective mass imbalance between the two layers or a moiré potential in one layer, as well as under the time-reversal symmetry breaking realized by applying a magnetic field. Considering the wide tunability of layered materials, the frequencies and chirality of phonons can both be tuned by varying the system parameters. These findings suggest that bilayer honeycomb-type Wigner crystals can serve as an exciting new platform for studying chiral phonons.

关键词: chiral phonon, bilayer Wigner crystal, transition metal dichalcogenides, moiré pattern

Abstract: We theoretically investigated the chiral phonons of honeycomb-type bilayer Wigner crystals recently discovered in van der Waals structures of layered transition metal dichalcogenides. These chiral phonons can emerge under the inversion symmetry breaking introduced by an effective mass imbalance between the two layers or a moiré potential in one layer, as well as under the time-reversal symmetry breaking realized by applying a magnetic field. Considering the wide tunability of layered materials, the frequencies and chirality of phonons can both be tuned by varying the system parameters. These findings suggest that bilayer honeycomb-type Wigner crystals can serve as an exciting new platform for studying chiral phonons.

Key words: chiral phonon, bilayer Wigner crystal, transition metal dichalcogenides, moiré pattern

中图分类号:  (Electron solids)

  • 73.20.Qt
73.21.Ac (Multilayers) 73.21.Cd (Superlattices) 63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)