Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules

Details Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules

2008-03-12

arxiv.org/abs/0803.1734v2

Phys. Rev. B 78, 085302 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final extended version, 8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.78.085302

We study phonon-assisted electron tunneling in semiconductor quantum dot molecules. In particular, singlet-singlet relaxation in a two-electron doped structure is considered. The influence of Coulomb interaction is discussed via comparison with a single electron system. We find that the relaxation rate reaches similar values in the two cases but the Coulomb interaction shifts the maximum rates towards larger separations between the dots. The difference in electron-phonon interaction between deformation potential and piezoelectric coupling is investigated. We show that the phonon-induced tunneling between two-electron singlet states is a fast process, taking place on the time scales of the order of a few tens of picoseconds.

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