Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot

Details Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot

2005-06-08

arxiv.org/abs/cond-mat/0506193v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.056803

Spin relaxation from a triplet excited state to a singlet ground state in a semiconductor quantum dot is studied by employing an electrical pump-and-probe method. Spin relaxation occurs via cotunneling when the tunneling rate is relatively large, confirmed by a characteristic square dependence of the relaxation rate on the tunneling rate. When cotunneling is suppressed by reducing the tunneling rate, the intrinsic spin relaxation is dominated by spin-orbit interaction. We discuss a selection rule of the spin-orbit interaction based on the observed double-exponential decay of the triplet state.

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