Non-markovian model of photon-assisted dephasing by electron-phonon interactions in a coupled quantum-dot-cavity system

Per Kær Nielsen, Torben Roland Nielsen, Peter Lodahl, Jesper Mørk, Antti-Pekka Jauho

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    Abstract

    We investigate the influence of electron-phonon interactions on the dynamical properties of a quantum-dot-cavity QED system. We show that non-Markovian effects in the phonon reservoir lead to strong changes in the dynamics, arising from photon-assisted dephasing processes, not present in Markovian treatments. A pronounced consequence is the emergence of a phonon induced spectral asymmetry when detuning the cavity from the quantum-dot resonance. The asymmetry can only be explained when considering the polaritonic quasiparticle nature of the quantum-dot-cavity system. Furthermore, a temperature induced reduction of the light-matter coupling strength is found to be relevant in interpreting experimental data, especially in the strong coupling regime.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume104
    Issue number15
    Pages (from-to)157401
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2010

    Bibliographical note

    Copyright (2010) American Physical Society

    Keywords

    • excitons
    • semiconductor quantum dots
    • Electron-phonon interactions
    • markov processes
    • photons

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