arXiv:0709.4330 [cond-mat.mes-hall]AbstractReferencesReviewsResources
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
Published 2007-09-27Version 1
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.