Spin-dependent photoconductivity in nonmagnetic semiconductors at room temperature

Erratum Applied physics Letters Vol 96, n° 23, 2010. doi = 10.1063/1.3449140International audienceBy combining optical spin injection techniques with transport spectroscopy tools, we demonstrate a spin-photodetector allowing for the electrical measurement and active filtering of conduction band electron spin at room temperature in a simple nonmagnetic GaAsN semiconductor structure. By switching the polarization of the incident light from linear to circular, we observe a spin dependent photoconductivity change reaching up to 40% without the need of an external magnetic field. The spin dependent photoconductivity change relies on the efficient spin filtering effect of conduction band electrons on N-induced Ga self-interstitial deep paramagnetic centers