Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot
arXiv:cond-mat/0506193 · doi:10.1103/PhysRevLett.95.056803
Abstract
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.
arXiv comment4 pages, 4 figures
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