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

TL;DR

This study reveals that the phonon-induced damping of Rabi oscillations in exciton-biexciton quantum dots depends strongly on the polarization of the excitation pulse, with maximal damping for linear polarization and reduced damping for elliptical polarization.

Contribution

It introduces a detailed analysis of polarization-dependent phonon effects in quantum dot systems, combining exact simulations and analytical models to explain the phenomena.

Findings

Damping varies with pulse polarization, being maximal for linear polarization.

Efficient coupling to the biexciton state influences polarization dependence.

Finite biexciton binding energies lead to qualitatively different Rabi dynamics.

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.