Influence of Landau levels in the phonon dispersion of Weyl semimetals

ORAL

Abstract

Discovered in high-energy physics, the chiral anomaly has recently made way to materials science by virtue of Weyl semimetals (WSM). Thus far, the main efforts to probe the chiral anomaly in WSM have concentrated on electronic phenomena. Nevertheless, recent theoretical works [1,2] have studied signatures of the chiral anomaly in the dynamics of lattice vibrations, to first order in the external magnetic field. In this work, we generalize those earlier results to magnetic fields of arbitrary strength by incorporating the influence of Landau levels in the phonon spectra. We predict a hybridization between plasmons and optical phonons that becomes potentially observable at high magnetic fields, and we identify fingerprints of chiral Landau levels in the sound velocity.

[1] Z. Song, J. Zhao, Z. Fang and X. Dai, Phys. Rev. B 94, 214306 (2016).

[2] P. Rinkel, P. L. S. Lopes and I. Garate, Phys. Rev. Lett. 119, 107401 (2017).

*This research has been funded by the Natural Sciences and Engineering Research Council of Canada, the Fonds de Recherche du Québec - Nature et Technologies, and Canada's First Research Excellence Fund.

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Presenters

  • Ion Garate

    • Universite de Sherbrooke
    • Institut quantique, Université de Sherbrooke
    • Institut quantique and Département de Physique, Université de Sherbrooke

Authors

  • Pierre Rinkel

    • Universite de Sherbrooke

  • Pedro Lopes

    • Physics, University of British Columbia
    • Stewart Blusson Quantum Matter Institute, University of British Columbia

  • Ion Garate

    • Universite de Sherbrooke
    • Institut quantique, Université de Sherbrooke
    • Institut quantique and Département de Physique, Université de Sherbrooke