Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session I
HL 44.35: Poster
Dienstag, 15. März 2011, 18:00–21:00, P3
Semiconductor spin noise spectroscopy in oblique magnetic fields — •Georg Müller, Fabian Berski, Jens Hübner, and Michael Oestreich — Abteilung Nanostrukturen, Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, D-30167 Hannover
Spin noise spectroscopy (SNS) is a powerful experimental technique to resolve equilibrium electron spin fluctuations in semiconductor systems [1]. Here, we present spin noise measurements in bulk GaAs with an arbitrary angle between magnetic field and the direction of light propagation. Usually, a magnetic field is applied in SNS in Voigt geometry, i.e., transverse to the direction of probe light propagation, to modulate the detected spin fluctuations with the Larmor frequency. This traditional experimental scheme is applied for measurements of the transverse spin dephasing time T2(∗). A magnetic field along the light wave vector, i.e., in Faraday geometry, introduces a splitting of the probed spin states. Correspondingly, energy relaxation accompanies the spin fluctuations and SNS with a longitudinal magnetic field is sensitive to the spin relaxation time T1. The new experimental geometry presented in this contribution allows simultaneous detection of spin dephasing and relaxation in a single measurement. The strength of SNS in this particular experiment lies in the fact that spin dephasing and relaxation are separated in the spin noise spectrum by the Larmor frequency while these different dynamics would overlap in the time domain in corresponding measurements via pump-probe techniques.
[1] G. M. Müller et al., Physica E 43, 569 (2010).