Dresden 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Halbleiterphysik

HL 46: Quantum dots and wires: Preparation and characterization II

HL 46.4: Vortrag

Donnerstag, 30. März 2006, 16:00–16:15, POT 51

Theory of spin-orbit effects and spin relaxation in single and coupled quantum dots. — •Peter Stano and Jaroslav Fabian — Institut I - Theoretische Physik, Universität Regensburg

Spin-orbit effects and phonon-induced spin relaxation in laterally coupled quantum dots in the presence of magnetic field are investigated by exact numerical diagonalization. Both Bychkov-Rashba and Dresselhaus spin-orbit couplings are included. Several new phenomena are predicted. In particular, we shown that coherent tunneling between the dots depend on the spin, enabling a scheme for spin-to-charge conversion by spin separation in a homogeneous magnetic field. Furthermore, we show that spin relaxation is highly anisotropic, both in terms of the direction of the double-dot axis as well as the direction of the magnetic field. The anisotropy comes from spin-orbit coupling. Calculated spin relaxation rates of GaAs single dots agree with a recent experiment.