TY - JOUR
T1 - Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot
AU - Sasaki, S.
AU - Fujisawa, T.
AU - Hayashi, T.
AU - Hirayama, Y.
N1 - Funding Information:
AS is thankful to Dean CBSH andDirector, Experiment Station of G.B. Pant University of Agriculture and Technology, Pantnagar-263145 for providing necessary facilities. M.W.A. is thankful to the Department of Science and Technology (DST) for funding under the DST fast-track scheme of young scientists. Work on the molecular analysis of Fusarium in N.T.’s laboratory is partially supported by the Department of Science and Technology (DST) and the Department of Biotechnology (DBT), Government of India.
PY - 2005/7/29
Y1 - 2005/7/29
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.95.056803
DO - 10.1103/PhysRevLett.95.056803
M3 - Article
AN - SCOPUS:27144437530
SN - 0031-9007
VL - 95
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 056803
ER -