Quantum diffusion of dipole-oriented indirect excitons in coupled quantum wells
Department of Physics and Astronomy, Cardiff University
Cardiff CF24 3YB, UK
Accepted: 14 May 2002
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 coupled quantum wells.
PACS: 71.35.-y – Excitons and related phenomena / 73.63.Hs – Quantum wells
© EDP Sciences, 2002