Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 71: Quantum Dots: Optical Properties

HL 71.5: Talk

Thursday, March 17, 2011, 11:15–11:30, POT 251

Observation of nuclear spin-polarization through electrical and optical injection of spin-polarized electrons in a spin-LED — •Pablo Asshoff, Gunter Wüst, Andreas Merz, Christoph Krämmer, Heinz Kalt, and Michael Hetterich — Karlsruhe Institute of Technology (KIT)

We present a detailed investigation of spin-polarization of quantum dot nuclei in a spin light-emitting diode by analyzing the Overhauser shift. Pumping of the nuclear spins is achieved with either electrical or optical excitation. Typical quantum dots exhibit a behavior where both excitation modes result in an asymmetrical Overhauser shift of comparable magnitude, which we analyze in a theoretical framework.