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arXiv · 1208.5606

Spin-orbit coupled particle in a spin bath

Peter Stano·Jaroslav Fabian·Igor Žutić
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Abstract

We consider a spin-orbit coupled particle confined in a quantum dot in a bath of impurity spins. We investigate the consequences of spin-orbit coupling on the interactions that the particle mediates in the spin bath. We show that in the presence of spin-orbit coupling, the impurity-impurity interactions are no longer spin-conserving. We quantify the degree of this symmetry breaking and show how it relates to the spin-orbit coupling strength. We identify several ways how the impurity ensemble can in this way relax its spin by coupling to phonons. A typical resulting relaxation rate for a self-assembled Mn-doped ZnTe quantum dot populated by a hole is 1 $\mu$s. We also show that decoherence arising from nuclear spins in lateral quantum dots is still removable by a spin echo protocol, even if the confined electron is spin-orbit coupled.

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Peter Stano, Jaroslav Fabian, Igor Žutić. 2012-08-28. Spin-orbit coupled particle in a spin bath. https://doi.org/10.1103/physrevb.87.165303

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