Weyl phonons in chiral crystals

Abstract

Chirality is an indispensable concept that pervades fundamental science and nature, manifesting itself in diverse forms such as chiral quasiparticles and chiral structures. Of particular interest are Weyl phonons carrying specific Chern numbers and chiral phonons doing circular motions in crystals. Up to now, Weyl and chiral phonons have been studied independently and the interpretations of chirality seem to be different in these two concepts, impeding our understanding. Here, we demonstrate that Weyl and chiral phonons are entangled in chiral crystals. Employing a typical chiral crystal of elementary tellurium (Te) as a case study, we expound on the intrinsic relationship between Chern number of Weyl phonons and pseudo-angular momentum (PAM) of chiral phonons. In light of the mutual coupling, we propose Raman scattering as a new technique to demonstrate the existence of Weyl phonons in Te, by detecting the chirality-induced energy splitting between the two constituent chiral phonon branches for Weyl phonons. By using the same experimental approach, we also observe the obstructed phonon surface states for the first time.

arXiv comment7 pages, 5 figures (to appear in NanoLetters)

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Cited by in corpus (23)

• Magnetic order induced chiral phonons in a ferromagnetic Weyl semimetal
• Lattice dynamics in chiral tellurium by linear and circularly polarized Raman spectroscopy: crystal orientation and handedness
• Weyl Phonons: The connection of topology and chirality
• Understanding chiral charge-density wave by frozen chiral phonon
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• Theory of spin magnetization driven by chiral phonons
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• Chiral Phonons in 2D Halide Perovskites
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