Dresden 2009 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 49: Quantum dots: preparation and characterization
HL 49.9: Talk
Friday, March 27, 2009, 12:30–12:45, BEY 81
The role of the spin-orbit interaction on the exchange coupling in lateral coupled quantum dots — •Fabio Baruffa1, Peter Stano2, and Jaroslav Fabian1 — 1Institute for Theoretical Physics - University of Regensburg — 2Research Center of Quantum Information - Slovak Academy of Science, Bratislava
Direct exchange in coupled quantum dots is proposed as a means to manipulate spin qubits. In the presence of spin-orbit coupling the exchange is qualitatively changed: the total spin is no longer a good quantum number and chirality of the spins emerges. This is described by a new term in the Hamiltonian, the so called anisotropic exchange (proportional to the vector product of the two spins). We report systematic numerical and analytical calculations of both the direct and anisotropic exchange interactions, for realistic GaAs quantum dots, demonstrating the role of the Bychkov-Rashba and Dresselhaus spin-orbit coupling on the important two-electron interactions.
This work is supported by the GK638.