Phonon-mediated electron spin phase diffusion in a quantum dot

Details Phonon-mediated electron spin phase diffusion in a quantum dot Phonon-mediated electron spin phase diffusion in a quantum dot

2003-04-30

arxiv.org/abs/cond-mat/0305005v1

Physics

Condensed Matter

Materials Science

5 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.92.026601

An effective spin relaxation mechanism that leads to electron spin decoherence in a quantum dot is proposed. In contrast to 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 precession 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 mechanisms 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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