Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 9: Poster I

HL 9.3: Poster

Monday, March 27, 2006, 15:15–17:45, P3

Spin noise spectroscopy in GaAs — •M. Roemer, M. Oestreich, R.J. Haug, and D. Haegele — Institut für Festkörperphysik, Universität

We observe the thermal noise of electron spins in bulk GaAs by Faraday-rotation noise spectroscopy. This new experimental technique allows for nearly perturbation free measurements of the spin dynamics in semiconductors. Faraday-rotation is measured in the spectral region below the band gap, which avoids common problems like carrier heating and electron spin relaxation by spin interaction with optically created holes. We measure exemplarily the electron spin relaxation time and the electron Landé g–factor in n–doped GaAs at low temperatures and discuss the noise power in dependence on the probe wavelength. The measured noise power is compared to a theory based on Poisson distribution probability which yields good agreement.