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Topological acoustic triple point

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Title
Topological acoustic triple point
Author(s)
Sungjoon Park; Yoonseok Hwang; Hong Chul Choi; Bohm-Jung Yang
Publication Date
2021-11-22
Journal
Nature Communications, v.12, no.1
Publisher
Nature Research
Abstract
© 2021, The Author(s).Acoustic phonon is a classic example of triple degeneracy point in band structure. This triple point always appears in phonon spectrum because of the Nambu–Goldstone theorem. Here, we show that this triple point can carry a topological charge q that is a property of three-band systems with space-time-inversion symmetry. The charge q can equivalently be characterized by the skyrmion number of the longitudinal mode, or by the Euler number of the transverse modes. We call triple points with nontrivial q the topological acoustic triple point (TATP). TATP can also appear at high-symmetry momenta in phonon and spinless electron spectrums when Oh or Th groups protect it. The charge q constrains the nodal structure and wavefunction texture around TATP, and can induce anomalous thermal transport of phonons and orbital Hall effect of electrons. Gapless points protected by the Nambu–Goldstone theorem form a new platform to study the topology of band degeneracies.
URI
https://pr.ibs.re.kr/handle/8788114/10877
DOI
10.1038/s41467-021-27158-y
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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