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Demonstration of Rashba spin splitting in GaN-based heterostructures

Weber, Wolfgang ; Ganichev, Sergey ; Kvon, Z ; Bel'kov, V ; Golub, L ; Danilov, Sergey ; Weiss, Dieter ; Prettl, Wilhelm ; Cho, H ; Lee, J



Abstract

The circular photogalvanic effect, induced by infrared radiation, has been observed in (0001)-oriented n-GaN low dimensional structures. The photocurrent changes sign upon reversing the radiation helicity demonstrating the existence of spin splitting of the conduction band in k space in this type of materials. The observation suggests the presence of a sizeable Rashba type of spin splitting, caused by the built- in asymmetry at the AlGaN/GaN interface.


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