Biexciton recombination rates in self-assembled quantum dots

Abstract

The radiative recombination rates of interacting electron-hole pairs in a quantum dot are strongly affected by quantum correlations among electrons and holes in the dot. Recent measurements of the biexciton recombination rate in single self-assembled quantum dots have found values spanning from two times the single exciton recombination rate to values well below the exciton decay rate. In this paper, a Feynman path-integral formulation is developed to calculate recombination rates including thermal and many-body effects. Using real-space Monte Carlo integration, the path-integral expressions for realistic three-dimensional models of InGaAs/GaAs, CdSe/ZnSe, and InP/InGaP dots are evaluated, including anisotropic effective masses. Depending on size, radiative rates of typical dots lie in the regime between strong and intermediate confinement. The results compare favorably to recent experiments and calculations on related dot systems. Configuration interaction calculations using uncorrelated basis sets are found to be severely limited in calculating decay rates.

11 pages, 4 figures

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Cited by in corpus (18)

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• Coulomb interactions in single, charged self-assembled quantum dots: radiative lifetime and recombination energy
• Excitonic exchange effects on the radiative decay time of monoexcitons and biexcitons in quantum dots
• Carrier trapping and luminescence polarization in quantum dashes
• InP-based single-photon sources operating at telecom C-band with increased extraction efficiency
• Charge control in InP/GaInP single quantum dots embedded in Schottky diodes
• Entangled photon pairs from a quantum dot cascade decay: the effect of time-reordering
• A new model for the recombination and radiative lifetime of trions and biexcitons in spherically shaped semiconductor nanocrystals
• Decay dynamics of neutral and charged excitonic complexes in single InAs/GaAs quantum dots
• Excitonic complexes in MOCVD-grown InGaAs/GaAs quantum dots emitting at telecom wavelengths
• Photoluminescence spectroscopy of trions in quantum dots: a theoretical description
• A simple variational quantum Monte Carlo-effective mass approach for excitons and trions in quantum dots
• Controlling the polarisation correlation of photon pairs from a charge-tuneable quantum dot
• Development of polaron-transformed explicitly correlated full configuration interaction method for investigation of quantum-confined Stark effect in GaAs quantum dots
• Optical recombination of biexcitons in semiconductors
• Theoretical analysis of influence of random alloy fluctuations on the opto-electronic properties of site-controlled (111)-oriented InGaAs/GaAs quantum dots
• Lateral spatial switching of excitons using vertical electric fields in semiconductor quantum rings
• Renormalization of excitonic properties by polar phonons