Photogalvanic effects for interband absorption in AlGaNGaN superlattices
Journal
Applied Physics Letters
Journal Volume
90
Journal Issue
4
Date Issued
2007
Author(s)
Abstract
The linear and circular photogalvanic effects (CPGEs), induced by ultraviolet (325nm) radiation, have been observed in the (0001)-oriented Al0.15Ga0.85N∕GaN superlattices. The CPGE current changes sign upon reversing the radiation helicity, and it is up to two orders of magnitude larger than that obtained by far-infrared radiation. This result suggests the existence of a sizeable Rashba spin splitting in AlGaN∕GaN superlattices. It also provides a possibility for the generation of spin orientation-induced current at room temperature.
Type
journal article