Phonon-mediated electron-spin phase diffusion in a quantum dot |
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Authors: | Semenov Y G Kim K W |
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Institution: | Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695-7911, USA. |
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Abstract: | An effective spin relaxation mechanism that leads to electron spin decoherence in a quantum dot is proposed. In contrast with the common calculations of spin-flip transitions between the Kramers doublets, we take into account a process of phonon-mediated fluctuation in the electron spin preces-sion and subsequent spin phase diffusion. Specifically, we consider modulations in the longitudinal g factor and hyperfine interaction induced by the phonon-assisted transitions between the lowest electronic states. Prominent differences in the temperature and magnetic field dependence between the proposed mechanism and the spin-flip transitions are expected to facilitate its experimental verification. Numerical estimation demonstrates highly efficient spin relaxation in typical semiconductor quantum dots. |
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