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

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Cited by in corpus (12)

• Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules
• Phonon-induced dephasing of singlet-triplet superpositions in double quantum dots without spin-orbit coupling
• Phonon-assisted relaxation between hole states in quantum dot molecules
• Excitons in quantum dot molecules: Coulomb coupling, spin-orbit effects and phonon-induced line broadening
• Theory of phonon-mediated relaxation in doped quantum dot molecules
• Phonon-assisted tunnelling of electrons in a quantum well-quantum dot injection structure
• Phonon assisted resonant tunnelling and its phonons control
• Probing bath-induced entanglement in a qubit pair by measuring photon correlations
• Decoherence enhanced quantum measurement of a quantum dot spin qubit
• Indirect spin dephasing via charge state decoherence in optical control schemes in quantum dots
• Phonon-assisted tunnelling in a double quantum dot molecule immersed in a cavity
• Phonon influence on the measurement of spin states in double quantum dots using the quantum point contact