Raman study of lattice dynamics in Weyl semimetal TaAs

2015/06/15 by H. W. Liu, P. Richard, Z. D. Song +4 · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.92.064302

published as Phys. Rev. B 92, 064302 (2015) · 5 pages, 3 figures

arxiv created 2015/06/15 · arxiv updated 2015/08/12

Abstract

We report a polarized Raman study of Weyl semimetal TaAs. We observe all the optical phonons, with energies and symmetries consistent with our first-principles calculations. We detect additional excitations assigned to multiple-phonon excitations. These excitations are accompanied by broad peaks separated by 140~cm^-1 that are also most likely associated with multiple-phonon excitations. We also noticed a sizable B₁ component for the spectral background, for which the origin remains unclear.

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• Phonon-based determination of elastic coefficients in the Weyl semimetal TaAs

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