Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 33: Spin-dependent Transport I
HL 33.12: Vortrag
Dienstag, 15. März 2011, 13:15–13:30, POT 251
Separation of Spin and Charge Currents by Photovoltage Measurements in n-InGaAs — •Stefan Göbbels1,2, Philipp Schäfers1,2, Klaus Schmalbuch1,2, Thomas Schäpers3,2, Mihail Lepsa3,2, Gernot Güntherodt1,2, and Bernd Beschoten1,2 — 1II. Phys. Institut A, RWTH Aachen University, 52056 Aachen — 2JARA: Fundamentals of Future Information Technology — 3Institut für Bio- und Nanosysteme IBN-1, Forschungszentrum Jülich, 52425 Jülich
Spin photocurrents have gained strong attention in the field of spintronics as they convert spin information into electric voltage and spin-polarized currents. Many effects yielding spin-photocurrents have been demonstrated in 2DEGs, e.g. spin-galvanic effect and magneto-gyrotropic photogalvanic effect [1]. However, no direct proof of the spin polarization of these currents has been reported yet.
We present photovoltage measurements on n-InGaAs epilayers combined with Faraday rotation spectroscopy for the detection of the spin polarization. The photovoltage consists of both a light polarization dependent and an independent component which exhibit different energy dependencies. Comparison with the spin sensitive measurements of the Faraday rotation allows us to separate spin from charge voltages.
[1] S. D. Ganichev & W. Prettl, J. Phys. Cond. Mat. 15, R935 (2003)
This work has been supported by DFG through FOR 912.