Detection of phonon helicity in nonchiral crystals with Raman scattering

Abstract

Recently, it has been predicted that the Berry curvature of electrons can produce an angular momentum for phonons. In systems with time-reversal symmetry, the direction of the phonon angular momentum is locked to the phonon wave vector. Accordingly, this phenomenon has received the name of ``phonon helicity". Here, we present a theory to unveil the signatures of such phonon helicity using Raman scattering. We show that the intensity of Raman scattering for circularly polarized light in BaMnSb${}_2$ (a prototypical nonchiral Dirac insulator) changes under a reversal of the phonon wave vector, and that the phonon helicity can be inferred from that change. We compare our results to recent reports of Raman-based detection of phonon angular momentum in chiral crystals.

arXiv comment6 pages, 1 figure, 2 appendices

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Cited by in corpus (5)

• Comprehensive Study of Phonon Chirality under Symmetry Constraints
• Spin-orbit interaction enabled electronic Raman scattering from charge collective modes
• Raman tensor for two-dimensional massive Dirac fermions
• Tight-binding and density-functional study of the Raman tensor in two-dimensional massive Dirac fermion systems
• Inherited Berry curvature of phonons in Dirac materials with time-reversal symmetry