Singlet-triplet relaxation induced by confined phonons in nanowire-based quantum dots

Details Singlet-triplet relaxation induced by confined phonons in nanowire-based quantum dots Singlet-triplet relaxation induced by confined phonons in nanowire-based quantum dots

2010-07-07

arxiv.org/abs/1007.1070v1

Semiconductor Science and Technology 25, 125004 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1088/0268-1242/25/12/125004

The singlet-triplet relaxation in nanowire-based quantum dots induced by confined phonons is investigated theoretically. Due to the quasi-one-dimensional nature of the confined phonons, the singlet-triplet relaxation rates exhibit multi-peaks as function of magnetic field and the relaxation rate between the singlet and the spin up triplet state is found to be enhanced at the vicinity of the singlet-triplet anti-crossing. We compare the effect of the deformation-potential coupling and the piezoelectric coupling and find that the deformation-potential coupling dominates the relaxation rates in most cases.

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