Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: Devices
HL 35.4: Vortrag
Donnerstag, 29. März 2007, 10:45–11:00, H13
Geometrical spin dephasing in quantum dots — •Pablo San-Jose1, Gergely Zarand2, Alexander Shnirman1, and Gerd Schön1 — 1Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe,D-76128 Karlsruhe, Germany. — 2Institute of Physics, Technical University Budapest, Budapest, H-1521, Hungary.
We study the relaxation and dephasing of electron spins in quantum dots that is mediated by spin-orbit coupling, and show that higher order contributions provide a relaxation mechanism that dominates in the limit of low magnetic fields. This relaxation is of geometrical origin. We further observe that in the low-field limit the relaxation processes are dominated by coupling to electron-hole excitations rather than by phonons. We also consider the possibility of spin manipulation by spin-orbit induced geometric phases.