Quantum diffusion of dipole-oriented indirect excitons in coupled quantum wells

Abstract

A model for diffusion of statistically-degenerate excitons in (coupled) quantum wells is proposed and analysed. Within a microscopic approach, we derive a quantum diffusion equation, calculate and estimate the self-diffusion coefficient for excitons in quantum wells and derive a modified Einstein relation adapted to statistically-degenerated quasi-two-dimensional bosons. It is also shown that the dipole-dipole interaction of indirect excitons effectively screens long-range-correlated disorder in quantum wells. Numerical calculations are given for indirect excitons in GaAs/AlGaAs coupled quantum wells.

To appear in Europhysics Letters

References in corpus (1)

• Phonon-assisted relaxation kinetics of statistically-degenerate excitons in high-quality quantum wells

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