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

被引:19
|
作者
Maier, Franziska [1 ]
Loss, Daniel [1 ]
机构
[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland
关键词
ATOMIC SCREENING CONSTANTS; ZINCBLENDE SEMICONDUCTORS; SINGLE; BAND; RESONANCES; STRESS;
D O I
10.1103/PhysRevB.85.195323
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 nonmonotonic 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.
引用
收藏
页数:6
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