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arXiv · 1203.3876

Effect of strain on hyperfine-induced hole-spin decoherence in quantum dots

Franziska Maier·Daniel Loss
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Abstract

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 $T_2$ 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 $T_2$ 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 $T_2$ on strain.

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Franziska Maier, Daniel Loss. 2012-03-17. Effect of strain on hyperfine-induced hole-spin decoherence in quantum dots. https://doi.org/10.1103/physrevb.85.195323

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