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

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• 作者：W. Weber ; S. Seidl ; V.V. Bel’ ; kov ; L.E. Golub ; S.N. Danilov ; E.L. Ivchenko ; W. Prettl ; Z.D. Kvon ; Hyun-Ick Cho ; Jung-Hee Lee ; S.D. Ganichev
• 关键词：A. Gallium nitride ; A. Two-dimensional systems ; D. Photogalvanic effects
• 刊名：Solid State Communications
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：145
• 期：1-2
• 页码：56-60
• 全文大小：394 K

文摘

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.