Photocurrents in gyrotropic Weyl semimetals

Abstract

We present results of a theoretical study of photocurrents in the Weyl semimetals belonging to the gyrotropic symmetry classes. We show that, in weakly gyrotropic symmetry classes C${}_{nv}$ ($n=3,4,6$), the circular photocurrent transverse to the incidence direction appears only with account, in the electron effective Hamiltonian, for both linear and quadratic or cubic in quasi-momentum spin-dependent terms as well as a spin-independent term resulting in the tilt of the cone dispersion. A polarization-independent magneto-induced photocurrent is predicted which is also allowed in gyrotropic systems only. For crystals of the C${}_{2v}$ symmetry, we consider a microscopic mechanism of the photocurrent in a quantized magnetic field which is generated under direct optical transitions between the ground and the first excited magnetic subbands. It is shown that this current becomes nonzero with allowance for anisotropic tilt of the dispersion cones.

arXiv comment4 pages, accepted to JETP Letters

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• Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
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• Photocurrents in Weyl semimetals
• Observation of Fermi Arcs in Type-II Weyl Semimetal Candidate WTe2
• Predicted Unusual Magnetoresponse in Type-II Weyl Semimetals
• Magnetic-field-induced relativistic properties in type-I and type-II Weyl semimetals
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