Controlling hole spins in quantum dots and wells
Beijing Computational Science Research Center, 100084, Beijing, China
2 Department of Physics, McGill University, H3A 2T8, Montréal, Québec, Canada
* e-mail: email@example.com
Accepted: 27 March 2014
Published online: 20 May 2014
We review recent theoretical results for hole spins influenced by spin-orbit coupling and Coulomb interaction in two-dimensional quantum wells as well as the decoherence of single hole spins in quantum dots due to hyperfine interaction with surrounding nuclear spins. After reviewing the different forms of spin-orbit coupling that are relevant for electrons and heavy holes in III-V semiconductor quantum wells, we illustrate the combined effect of spin-orbit coupling and Coulomb interactions for hole systems on spin-dependent quasiparticle group velocities. We further analyze spin-echo decay for a single hole spin in a nuclear-spin bath, demonstrating that this decoherence source can be controlled in these systems by entering a motional-averaging regime. Throughout this review, we emphasize physical effects that are unique to hole spins (rather than electrons) in nanoscale systems.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2014