Signatures of molecular correlations in the few-electron dynamics of coupled quantum dots

Details Signatures of molecular correlations in the few-electron dynamics of coupled quantum dots Signatures of molecular correlations in the few-electron dynamics of coupled quantum dots

2007-10-30

arxiv.org/abs/0710.5617v1

Phys. Rev. B 76, 233303 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, RevTex4 two-column format, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.233303

We study the effect of Coulomb interaction on the few-electron dynamics in coupled semiconductor quantum dots by exact diagonalization of the few-body Hamiltonian. The oscillation of carriers is strongly affected by the number of confined electrons and by the strength of the interdot correlations. Single-frequency oscillations are found for either uncorrelated or highly correlated states, while multi-frequency oscillations take place in the intermediate regime. Moreover, Coulomb interaction renders few-particle oscillations sensitive to perturbations in spatial directions other than that of the tunneling, contrary to the single-particle case. The inclusion of acoustic phonon scattering does not modify the carrier dynamics substantially at short times, but can damp oscillation modes selectively at long times.

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