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.
Original language | English |
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Article number | 056803 |
Journal | Physical review letters |
Volume | 95 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2005 Jul 29 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy(all)