Chiral Phonons at High-Symmetry Points in Monolayer Hexagonal Lattices
Open accessAbstract
In monolayer hexagonal lattices, the intravalley and intervalley scattering of electrons can involve chiral phonons at Brillouin-zone center and corners, respectively. At these high-symmetry points, there is a threefold rotational symmetry endowing phonon eigenmodes with a quantized pseudoangular momentum, which includes orbital and spin parts. Conservation of pseudoangular momentum yields selection rules for intravalley and intervalley scattering of electrons by phonons. Concrete predictions of helicity-resolved optical phenomena are made on monolayer molybdenum disulfide. The chiral phonons at Brillouin-zone corners excited by polarized photons can be detected by a valley phonon Hall effect. The chiral phonons, together with phonon circular polarization, phonon pseudoangular momentum, selection rules, and valley phonon Hall effect will extend the basis for valley-based electronics and phononics applications in the future.
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Transition metal dichalcogenides have recently been predicted and observed to host chiral phonons that are intrinsically circularly polarized.
“These materials have recently been predicted and observed to host chiral phonons that are intrinsically circularly polarized45,46.”
From Terahertz electric-field-driven dynamical multiferroicity in SrTiO3 (2024) · cites this paper as [45]
The opening summary (p. 1) reports chiral phonons with valley-contrasting circular polarization in monolayer MoS₂. The MoS₂ discussion (p. 3) describes calculated phonon modes, supporting the prediction, but our copy does not report an experimental observation of chiral phonons; the experiments it mentions concern electronic valley polarization. (LLM, conf=0.88)
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- Authors
- Zhang, L., & Niu, Q.
- Affiliations
- Nanjing Normal University (CN)
- Peking University (CN)
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2015-09-11
- Volume
- 115
- Issue
- 11
- Pages
- 115502-115502
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W1871729825
- Cited by
- 441
- References
- 39
- Citations by year
- 2026: 64 · 2025: 74 · 2024: 65 · 2023: 51 · 2022: 62 · 2021: 39 · 2020: 24 · 2019: 25 · 2018: 21 · 2017: 9 · 2016: 7
- FWCI
- 5.01
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- arXiv (Cornell University)
- Funders
- U.S. Department of Energy (DE-FG03-02ER45958)
- National Natural Science Foundation of China (91121004, 11574154)
- Welch Foundation (F-1255)
- NBRPC (2012CB-921300)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
- Keywords
- chiral phonons, high-symmetry points, intervalley scattering, intravalley scattering, selection rules, MoS2, valleytronics, phononics, threefold rotational symmetry
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