Photocurrent in gyrotropic Weyl semimetals
| Autor: | Boris Spivak, E. L. Ivchenko, Leonid Golub |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Photocurrent Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) Condensed matter physics FOS: Physical sciences Physics::Optics 02 engineering and technology Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Semimetal Magnetic field Transverse plane symbols.namesake Excited state Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences symbols 010306 general physics 0210 nano-technology Anisotropy Hamiltonian (quantum mechanics) |
| Zdroj: | JETP Letters. 105:782-785 |
| ISSN: | 1090-6487 0021-3640 |
| DOI: | 10.1134/s0021364017120062 |
| Popis: | 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. Comment: 4 pages, accepted to JETP Letters |
| Databáze: | OpenAIRE |
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