Electron Number Dependence of Spin Triplet-Singlet Relaxation Time
Abstract
In a GaAs single quantum dot, the relaxation time T1 between spin triplet and singlet states has been measured for the last few even number of electrons. The singlet-triplet energy separation EST is tuned as a control parameter for the comparison of T1 between different electron numbers. T1 shows a steady decrease from 2-electrons, 4-electrons, to 6-electrons, and we found this implies an enhancement of the spin-orbital coupling strength in a multi-electron quantum dot.
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