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HL: Halbleiterphysik

HL 21: Spintronik III

HL 21.9: Vortrag

Samstag, 5. März 2005, 12:45–13:00, TU P164

Pulsed electrical spin injection into III-V semiconductor heterostructures — •Nicolas Müsgens¹, Lars Schreiber¹, Georg Richter¹, Bernd Beschoten¹, Gernot Güntherodt¹, and Paul A. Crowell² — ¹II. Physikalisches Institut, RWTH Aachen, 52056 Aachen — ²School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

The implementation of coherent electron spins into semiconductors and the full control of their quatum mechanical degrees of freedom may eventually enable quantum computational operations in solid state devices. Spin coherence in semiconductors has so far only been established and monitored by time-resolved all optical pump probe techniques. Here, we use a novel time-resolved technique, which offers to electrically create and inject coherent spin states into a spin light-emitting diode using ultrafast current pulses (FWHM ∼ 100 ps). Both, transport and dephasing of the injected spin packets can be probed by phase-locked time-resolved Kerr rotation.

  Supported by BMBF FKZ BM 160