Raman study of lattice dynamics in Weyl semimetal TaAs

G.-F. Chen; H. Ding; H. W. Liu; L. X. Zhao; P. Richard; Z. D. Song; Z. Fang

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Raman study of lattice dynamics in Weyl semimetal TaAs

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arxiv 1506.04509 v1 pith:PGY3QIHY submitted 2015-06-15 cond-mat.mtrl-sci cond-mat.str-el

H. W. Liu , P. Richard , Z. D. Song , L. X. Zhao , Z. Fang , G.-F. Chen , H. Ding This is my paper

classification cond-mat.mtrl-scicond-mat.str-el

keywords excitationsmultiple-phononramansemimetaltaasweylaccompaniedadditional

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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 B$_1$ component for the spectral background, for which the origin remains unclear.

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