Abstract
We estimate the triplet-singlet relaxation rate due to spin-orbit coupling assisted by phonon emission in weakly-confined quantum dots. Our results for two and four electrons show that the different triplet-singlet relaxation trends observed in recent experiments under magnetic fields can be understood within a unified theoretical description, as the result of the competition between spin-orbit coupling and phonon emission efficiency. Moreover, we show that both effects are greatly affected by the strength of the confinement and the external magnetic field, which may give access to very long-lived triplet states as well as to selective population of the triplet Zeeman sublevels.
Highlights
Semiconductor quantum dotsQDsare called to play a central role in the emerging field of spintronics, because their zero-dimensional confinement constitutes an optimal environment to manipulate the spin of bound electrons.1 Understanding the spin relaxation in these structures is of utmost interest for their eventual use in practical devices
Our results for two and four electrons show that different triplet-singlet relaxation trends observed in recent experiments under magnetic fields can be understood within a unified theoretical description, as the result of the competition between spin-orbit coupling and phonon emission efficiency
One such case is the role of an external magnetic field: experimental measurements away from the TS anticrossings suggest that the influence of axial fields on the spin relaxation is fairly weak,3,4 in strong contrast with the singleelectron case
Summary
Semiconductor quantum dotsQDsare called to play a central role in the emerging field of spintronics, because their zero-dimensional confinement constitutes an optimal environment to manipulate the spin of bound electrons.1 Understanding the spin relaxation in these structures is of utmost interest for their eventual use in practical devices. Magnetic field dependence of triplet-singlet relaxation in quantum dots with spin-orbit coupling
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