Polarization dependence of phonon influences in exciton-biexciton quantum dot systems

Abstract

We report on a strong dependence of the phonon-induced damping of Rabi dynamics in an optically driven exciton-biexciton quantum dot system on the polarization of the exciting pulse. While for a fixed pulse intensity the damping is maximal for linearly polarized excitation, it decreases with increasing ellipticity of the polarization. This finding is most remarkable considering that the carrier-phonon coupling is spin-independent. In addition to simulations based on a numerically exact real-time path integral approach, we present an analysis within a weak coupling theory that allows for analytical expressions for the pertinent damping rates. We demonstrate that an efficient coupling to the biexciton state is of central importance for the reported polarization dependencies. Further, we discuss influences of various system parameters and show that for finite biexciton binding energies Rabi scenarios differ qualitatively from the widely studied two-level dynamics.

References in corpus (5)

• Phonon induced Rabi frequency renormalization of optically driven single InGaAs/GaAs quantum dots
• Resonant nature of phonon-induced damping of Rabi oscillations in quantum dots
• Two qubit conditional quantum logic operation in a single self-assembled quantum dot
• Reducing decoherence of the confined exciton state in a quantum dot by pulse-sequence control
• Theory of two-photon processes in quantum dots: coherent evolution and phonon-induced dephasing

Cited by in corpus (2)

• The role of phonons for exciton and biexciton generation in an optically driven quantum dot
• Biexciton state preparation in a quantum dot via adiabatic rapid passage: comparison between two control protocols and impact of phonon-induced dephasing