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

Article

关键词: REDUCED DENSITY-MATRICES;    TENSOR PROPAGATOR;    RABI OSCILLATIONS;    TIME EVOLUTION;    DYNAMICS;   

DOI  :  10.1103/PhysRevB.86.245306

来源: SCIE

【 摘 要 】

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. DOI: 10.1103/PhysRevB.86.245306

【 授权许可】

Free