Anisotropic spin relaxation in quantum dots

Abstract

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.

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

References in corpus (6)

• Single-shot read-out of an individual electron spin in a quantum dot
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• Orbital and spin relaxation in single and coupled quantum dots
• Anisotropy of spin splitting and spin relaxation in lateral quantum dots