Abstract

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 a function of magnetic field, and the relaxation rate between the singlet and the spin-up triplet state is found to be enhanced in 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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