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Cited by 448Acoustic Wave Phenomena ResearchTopological Materials and PhenomenaQuantum and electron transport phenomena

Valley Vortex States in Sonic Crystals

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Lu, Jiuyang, Qiu, Chunyin, Ke, Manzhu, Liu, Zhengyou·2016·Physical Review Letters
DOI 10.1103/physrevlett.116.093901
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Abstract

Valleytronics is quickly emerging as an exciting field in fundamental and applied research. In this Letter, we study the acoustic version of valley states in sonic crystals and reveal a vortex nature of such states. In addition to the selection rules established for exciting valley polarized states, a mimicked valley Hall effect of sound is proposed further. The extraordinary chirality of valley vortex states, detectable in experiments, may open a new possibility in sound manipulations. This is appealing to scalar acoustics that lacks a spin degree of freedom inherently. In addition, the valley selection enables a handy way to create vortex matter in acoustics, in which the vortex chirality can be controlled flexibly. Potential applications can be anticipated with the exotic interaction of acoustic vortices with matter, such as to trigger the rotation of the trapped microparticles without contact.

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  • The fields at the K′ valley could be obtained by the time-reversal operation, which reverses the direction of the energy flux and hence the circular polarization of the state.

    “The fields at the K′ valley could be obtained by the time-reversal operation, which reverses the direction of the energy flux and hence the circular polarization of the state16,49.”

    From Direct observation of valley-polarized topological edge states in designer surface plasmon crystals (2017) · cites this paper as [49]

    The passage labelled Abstract (page unavailable) says the K′ valley states follow from time-reversal symmetry and have reversed vortex chirality; the Fig. 2 discussion identifies the associated Poynting vectors. It does not describe this as a reversal of circular polarization, and elsewhere says the longitudinal acoustic system lacks intrinsic spin polarizations. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

  • Breaking the ΓK-mirror symmetry of the unit cell by making R1 and R2 unequal lifts the degeneracy between the first and second bands at the valleys and opens a full bandgap.

    “We then introduce a perturbation to break the ΓK-mirror symmetry of the unit cell, which will lift the degeneracy at the valleys and hence open a bandgap20,49.”

    From Direct observation of valley-polarized topological edge states in designer surface plasmon crystals (2017) · cites this paper as [49]

    The indexed passage labeled Abstract (page unavailable) says that breaking spatial inversion symmetry produces an omnidirectional band gap separating lower- and higher-frequency valley states. It does not describe breaking ΓK-mirror symmetry by making R1 and R2 unequal, or explicitly identify the separated states as the first and second bands. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Cites

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Authors
Lu, J., Qiu, C., Ke, M., & Liu, Z.
Affiliations
Wuhan University (CN)
ORCID
Venue
Physical Review Letters
Publisher
American Physical Society (APS)
Published
2016-02-29
Volume
116
Issue
9
Pages
093901-093901
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
DOI
10.1103/physrevlett.116.093901
OpenAlex
W2581606756
Cited by
448
References
56
Citations by year
2026: 27 · 2025: 35 · 2024: 46 · 2023: 52 · 2022: 52 · 2021: 43 · 2020: 34 · 2019: 61 · 2018: 49 · 2017: 44 · 2016: 5
FWCI
25.71
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical Review Letters (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Natural Science Foundation of China (11174225, 11374233, 11534013, 11547310, J1210061)
  • National Basic Research Program of China (2015CB755500)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Acoustic Wave Phenomena Research
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
Keywords
valleytronics, sonic crystals, valley Hall effect, chirality, acoustic vortices, vortex matter, acoustic manipulation, microparticle rotation

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