Electron spin relaxation induced by phonon-mediated s-d exchange interaction in a II-VI diluted magnetic semiconductor quantum dot is investigated theoretically. The electron-acoustic phonon interaction due to piezoelectric coupling and deformation potential is included. The resulting spin lifetime is typically on the order of microseconds. The effectiveness of the phonon-mediated spin-flip mechanism increases with increasing Mn concentration, electron spin splitting, vertical confining strength and lateral diameter, while it shows non-monotonic dependence on the magnetic field and temperature. An interesting finding is that the spin relaxation in a small quantum dot is suppressed for strong magnetic field and low Mn concentration at low temperature.
@article{arxiv.cond-mat/0506715,
title = {Spin relaxation in diluted magnetic semiconductor quantum dots},
author = {W. Yang and K. Chang},
journal= {arXiv preprint arXiv:cond-mat/0506715},
year = {2007}
}
Comments
11 pages, 11 figures, to be published in Phys. Rev. B