Anisotropic spin relaxation in quantum dots

Details Anisotropic spin relaxation in quantum dots Anisotropic spin relaxation in quantum dots

2006-11-03

arxiv.org/abs/cond-mat/0611065v2

Phys. Rev. B 75, 041306(R) (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures. Extended version of paper published in PRB-RC

Scientific paper

10.1103/PhysRevB.75.041306

We study theoretically phonon-assisted spin relaxation of an electron confined in an elliptical quantum dot (QD) subjected to a tilted magnetic field. In the presence of both Rashba and Dresselhaus spin-orbit terms, the relaxation rate is anisotropic with respect to the in-plane field orientation. This anisotropy originates from the interference, at nonzero tilt angle, between the two spin-orbit terms. We show that, in a narrow range of magnetic field orientations, the relaxation rate exhibits anomalous sensitivity to variations of the QD parameters. In this range, the relative change in the relaxation rate with in-plane field orientation is determined {\em solely} by the spin-orbit coupling strengths and by the dot geometry. This allows simultaneous determination of both Rashba and Dresselhaus coupling parameters and the dot ellipticity from analysis of the angular dependence of the relaxation rate.

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