Spin relaxation in diluted magnetic semiconductor quantum dots

Details Spin relaxation in diluted magnetic semiconductor quantum dots Spin relaxation in diluted magnetic semiconductor quantum dots

2005-06-28

arxiv.org/abs/cond-mat/0506715v2

Phys. Rev. B 72, 075303 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 11 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.075303

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.

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