Quenching of phonon-induced processes in quantum dots due to electron-hole asymmetries

Abstract

Differences in the confinement of electrons and holes in quantum dots are shown to profoundly impact the magnitude of scattering with acoustic phonons in materials where crystal deformation shifts the conduction and valence band in the same direction. Using an extensive model that includes the non-Markovian nature of the phonon reservoir, we show how the effect may be addressed by photoluminescence excitation spectroscopy of a single quantum dot. We also investigate the implications for cavity QED, i.e. a coupled quantum dot-cavity system, and demonstrate that the phonon scattering may be strongly quenched. The quenching is explained by a balancing between the deformation potential interaction strengths and the carrier confinement and depends on the quantum dot shape. Numerical examples suggest a route towards engineering the phonon scattering.

5 pages, 5 figures, submitted for peer review, comments are welcome

References in corpus (5)

• Design of Optomechanical Cavities and Waveguides on a Simultaneous Bandgap Phononic-Photonic Crystal Slab
• Influence of Pure Dephasing on Emission Spectra from Single Photon Sources
• Influence of electron-acoustic phonon scattering on off-resonant cavity feeding within a strongly coupled quantum-dot cavity system
• Microscopic theory of phonon-induced effects on semiconductor quantum dot decay dynamics in cavity QED
• High fidelity all-optical control of quantum dot spins: detailed study of the adiabatic approach

Cited by in corpus (3)

• Phonon-assisted robust and deterministic two-photon biexciton preparation in a quantum dot
• The role of phonons for exciton and biexciton generation in an optically driven quantum dot
• Decoherence in semiconductor cavity QED systems due to phonon scattering