2012/03/31 by Franziska Maier, Daniel Loss
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.85.195323
published as Phys. Rev. B 85, 195323 (2012)
arxiv created 2012/05/11 · arxiv updated 2012/05/30
We theoretically consider the effect of strain on the spin dynamics of a single heavy-hole (HH) confined to a self-assembled quantum dot and interacting with the surrounding nuclei via hyperfine interaction. Confinement and strain hybridize the HH states, which show an exponential decay for a narrowed nuclear spin bath. For different strain configurations within the dot, the dependence of the spin decoherence time T2 on external parameters is shifted and the non-monotonic dependence of the peak is altered. Application of external strain yields considerable shifts in the dependence of T2 on external parameters. We find that external strain affects mostly the effective hyperfine coupling strength of the conduction band (CB), indicating that the CB admixture of the hybridized HH states plays a crucial role in the sensitivity of T2 on strain.