Magneto-gyrotropic photogalvanic effects in GaN/AlGaN two-dimensional systems

Details Magneto-gyrotropic photogalvanic effects in GaN/AlGaN two-dimensional systems Magneto-gyrotropic photogalvanic effects in GaN/AlGaN two-dimensional systems

2007-09-27

arxiv.org/abs/0709.4330v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted for publication in Solid State Communications

Scientific paper

10.1016/j.ssc.2007.09.035

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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