Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 71: Quantum Dots: Optical Properties
HL 71.5: Vortrag
Donnerstag, 17. März 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.