Phonon-induced Exciton Dephasing in Quantum Dot Molecules

Abstract

A new microscopic approach to the optical transitions in quantum dots and quantum dot molecules, which accounts for both diagonal and non-diagonal exciton-phonon interaction, is developed. The cumulant expansion of the linear polarization is generalized to a multilevel system and is applied to calculation of the full time dependence of the polarization and the absorption spectrum. In particular, the broadening of zero-phonon lines is evaluated directly. It is found that in some range of the dot distance real phonon-assisted transitions between exciton states dominate the dephasing, while virtual transitions are of minor importance. The influence of Coulomb interaction, tunneling, and structural asymmetry on the exciton dephasing in quantum dot molecules is analyzed.

4 pages, 5 figures

References in corpus (3)

• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Dephasing in Quantum Dots: Quadratic Coupling to Acoustic Phonons
• Calculation of pure dephasing for excitons in quantum dots

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• Excitons in quantum dot molecules: Coulomb coupling, spin-orbit effects and phonon-induced line broadening
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• Phonon-Induced Dephasing in Quantum Dot-Cavity QED
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• Phonon effects on the radiative recombination of excitons in double quantum dots
• Near-field spectra of quantum well excitons with non-Markovian phonon scattering
• Nonlinear optical response and exciton dephasing in quantum dots
• Decay and persistence of spatial coherence during phonon-assisted relaxation in double quantum dots
• Zero-Phonon Line Broadening and Satellite Peaks in Nanowire Quantum Dots: The Role of Piezoelectric Coupling
• Impact of the phonon environment on the nonlinear quantum-dot-cavity QED. I. Path-integral approach
• Theory of Polaron Resonance in Quantum Dots and Quantum-Dot Molecules
• Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs
• Controlling dephasing of coupled qubits via shared-bath coherence
• Microscopic model for intersubband gain from electrically pumped quantum-dot structures