Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 122: Topology and Symmetry Protected Materials II

O 122.11: Talk

Friday, March 20, 2020, 13:00–13:15, WIL A317

Acoustogalvanic rectification in Dirac and Weyl semimetals — •Habib Rostami and Pavlo Sukhachov — Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden

In this talk, I will discuss a nonlinear mechanism to generate a direct electric current by passing acoustic wave in inversion-symmetric Dirac and Weyl semimetals. According to the similarity with the photogalvanic rectification, where a direct current is produced in a second order response to light, we called this phenomenon the acoustogalvanic effect [1]. It relies on pseudo-electromagnetic fields [2] originating from sound-induced strain. Unlike the standard acoustoelectric effect [3], which relies on the sound-induced deformation potential and the corresponding electric field, the acoustogalvanic one originates from the pseudo-electromagnetic fields, which are not subject to screening. Due to an interplay of the pseudoelectric and pseudomagnetic fields, the acoustogalvanic current shows a nontrivial dependence on the direction of the sound wave propagation. Being within the experimental reach, the effect can be utilized to explore dynamical deformations and probe the pseudo-electromagnetic fields, which are yet to be experimentally observed in Weyl and Dirac semimetals.

[1] P. O. Sukhachov and H. Rostami, arXiv:1911.04526 (2019).

[2] A. Cortijo et al. Phys. Rev. Lett. 115, 177202 (2015).

[3] R. H. Parmenter, Phys. Rev. 89, 990 (1953).