Leakage-induced decoherence during single electron spin manipulation in a double quantum dot

Details Leakage-induced decoherence during single electron spin manipulation in a double quantum dot Leakage-induced decoherence during single electron spin manipulation in a double quantum dot

2007-07-27

arxiv.org/abs/0707.4040v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

Coherent single electron spin oscillation in a double quantum dot system driven by a magnetic electron spin resonance field is studied theoretically using a Bloch-type rate equation approach. The oscillation frequency and relaxation time obtained using typical model parameters are consistent with experiment findings. The dominant decoherence mechanism is identified to be a leakage current through a Coulomb blockade barrier at a quantum dot during the spin manipulation. Nuclear field fluctuations which induce a long relaxation time are found to contribute only negligibly to the decoherence despite an earlier suggestion.

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