Nucleus-mediated spin-flip transitions in GaAs quantum dots

Details Nucleus-mediated spin-flip transitions in GaAs quantum dots Nucleus-mediated spin-flip transitions in GaAs quantum dots

2001-04-09

arxiv.org/abs/cond-mat/0104148v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTex 4 pages, 1 figure, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.195306

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.

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