Spin-flip rates in GaAs quantum dots can be quite slow, thus opening up the possibilities to manipulate spin states in the dots. We present here estimations of inelastic spin-flip rates mediated by hyperfine interaction with nuclei. Under general assumptions the nucleus mediated rate is proportional to the phonon relaxation rate for the corresponding non-spin-flip transitions. The rate can be accelerated in the vicinity of a singlet-triplet excited states crossing. The small proportionality coefficient depends inversely on the number of nuclei in the quantum dot. We compare our results with known mechanisms of spin-flip in GaAs quantum dot.
@article{arxiv.cond-mat/0104148,
title = {Nucleus-mediated spin-flip transitions in GaAs quantum dots},
author = {Sigurdur I. Erlingsson and Yuli V. Nazarov and Vladimir I. Fal'ko},
journal= {arXiv preprint arXiv:cond-mat/0104148},
year = {2009}
}
Comments
RevTex 4 pages, 1 figure, submitted to Phys. Rev. B