Anomalous sound attenuation in Weyl semimetals in magnetic and pseudomagnetic fields

Abstract

We evaluate the sound attenuation in a Weyl semimetal subject to a magnetic field or a pseudomagnetic field associated with a strain. Due to the interplay of intra- and inter-node scattering processes as well as screening, the fields generically reduce the sound absorption. A nontrivial dependence on the relative direction of the magnetic field and the sound wave vector, i.e., the magnetic sound dichroism, can occur in materials with nonsymmetric Weyl nodes (e.g., different Fermi velocities and/or relaxation times). It is found that the sound dichroism in Weyl materials can also be activated by an external strain-induced pseudomagnetic field. In view of the dependence on the field direction, the dichroism may lead to a weak enhancement of the sound attenuation compared with its value at vanishing fields.

19 pages, 4 multi-panel figures; two-column format and updated figures 2 and 3(b)

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Cited by in corpus (9)

• Phonon helicity induced by electronic Berry curvature in Dirac materials
• Nonreciprocal optics and magnetotransport in Weyl metals as signatures of band topology
• Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals
• Anomaly-induced sound absorption in Weyl semimetals
• Propagation of longitudinal acoustic phonons in ZrTe${}_5$ exposed to a quantizing magnetic field
• Detection of phonon helicity in nonchiral crystals with Raman scattering
• Phonon helicity and Nieh-Yan Anomaly in the Kramers-Weyl semimetals of Chiral Crystals
• Axionic Acoustic Phonons from Weyl Semimetals
• Geometric transport signatures of strained multi-Weyl semimetals