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

Abstract

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.

Final extended version, 8 pages, 9 figures

References in corpus (4)

• Phonon Decoherence of a Double Quantum Dot Charge Qubit
• Charge qubit dynamics in a double quantum dot coupled to phonons
• Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling
• Interplay and optimization of decoherence mechanisms in the optical control of spin quantum bits implemented on a semiconductor quantum dot

Cited by in corpus (1)

• Indirect spin dephasing via charge state decoherence in optical control schemes in quantum dots