Gate-tunable chiral phonons in low-buckled group-IVA monolayers
| Autor: | Xiao Li, Lifa Zhang, Zhichao Zhou, Hao Chen, Hanyu Wang, Chongqun Xia |
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| Rok vydání: | 2021 |
| Předmět: |
Field (physics)
Phonon FOS: Physical sciences Field strength 02 engineering and technology 01 natural sciences Condensed Matter::Materials Science Condensed Matter::Superconductivity Electric field Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Monolayer General Materials Science 010306 general physics Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Group (mathematics) Materials Science (cond-mat.mtrl-sci) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Brillouin zone Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Degeneracy (mathematics) |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 33(28) |
| ISSN: | 1361-648X |
| Popis: | We investigate the electric response of chiral phonons on the low-buckled group-IVA monolayers by performing first-principles calculations. The vertical electric field breaks the degeneracy of phonon modes at high-symmetry $\pm K$ points of the phonon Brillouin zone, and the size of the phononic gap is proportional to the strength of the electric field. The gapped phonon modes at $\pm K$ possess chiralities with considerable phonon circular polarizations and discrete phonon pseudoangular momenta. The chiralities of phonons are robust against the variation of the field strength, but reversed by changing the field direction. Electric control of chiral phonons adds a new dimension to the study of chiral phonons, which has potential use in the design of phononic and valley devices. Comment: 6 pages, 6 figures |
| Databáze: | OpenAIRE |
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