Magneto-gyrotropic photogalvanic effects in GaN/AlGaN two-dimensional systems
W. Weber, S. Seidl, S. N. Danilov, W. Prettl, V. V. Bel'kov, L. E., Golub, E. L. Ivchenko, Z. D. Kvon, Hyun-Ick Cho, Jung-Hee Lee, S. D. Ganichev
TL;DR
This paper reports the observation and analysis of magneto-gyrotropic and spin-galvanic effects in GaN/AlGaN heterojunctions excited by terahertz radiation, revealing spin-related photocurrent mechanisms in low-dimensional structures.
Contribution
It demonstrates the existence of magneto-gyrotropic and spin-galvanic effects in GaN/AlGaN heterostructures and discusses their microscopic spin-related mechanisms.
Findings
Photocurrents are generated by terahertz radiation in the presence of an in-plane magnetic field.
Microscopic mechanisms involve spin-related phenomena specific to hexagonal heterostructures.
Properties of these effects are analyzed for GaN/AlGaN systems.
Abstract
The magneto-gyrotropic photogalvanic and spin-galvanic effects are observed in (0001)-oriented GaN/AlGaN heterojunctions excited by terahertz radiation. We show that free-carrier absorption of linearly or circularly polarized terahertz radiation in low-dimensional structures causes an electric photocurrent in the presence of an in-plane magnetic field. Microscopic mechanisms of these photocurrents based on spin-related phenomena are discussed. Properties of the magneto-gyrotropic and spin-galvanic effects specific for hexagonal heterostructures are analyzed.
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