Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling

Details Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling

2006-10-18

arxiv.org/abs/cond-mat/0610509v2

Physical Review B 75, R081303 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures. Closely related to recent experiments in cond-mat/0609726

Scientific paper

10.1103/PhysRevB.75.081303

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.

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