Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots

Details Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots

2006-04-28

arxiv.org/abs/cond-mat/0604655v1

Physical Review B 74, 035313 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages (preprint format), 7 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.74.035313

We investigate charge relaxation rates due to acoustic phonons in weakly-confined quantum dot systems, including both deformation potential and piezoelectric field interactions. Single-electron excited states lifetimes are calculated for single and coupled quantum dot structures, both in homonuclear and heteronuclear devices. Piezoelectric field scattering is shown to be the dominant relaxation mechanism in many experimentally relevant situations. On the other hand, we show that appropriate structure design allows to minimize separately deformation potential and piezolectric field interactions, and may bring electron lifetimes in the range of microseconds.

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