| SPECIAL TOPIC — Moiré physics in two-dimensional materials |
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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 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 |
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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.
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Received: 29 September 2024
Revised: 01 November 2024
Accepted manuscript online: 05 November 2024
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PACS:
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73.20.Qt
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(Electron solids)
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73.21.Ac
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(Multilayers)
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73.21.Cd
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(Superlattices)
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63.22.-m
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(Phonons or vibrational states in low-dimensional structures and nanoscale materials)
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| Fund: 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). |
Corresponding Authors:
Hongyi Yu
E-mail: yuhy33@mail.sysu.edu.cn
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Cite this article:
Dingrui Yang(杨丁睿), Lingyi Li(李令仪), Na Zhang(张娜), and Hongyi Yu(俞弘毅) Chiral phonons of honeycomb-type bilayer Wigner crystals 2025 Chin. Phys. B 34 017301
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