Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-06-24
Europhys. Lett., vol. 59 (4), pp. 586-591 (2002)
Physics
Condensed Matter
Statistical Mechanics
To appear in Europhysics Letters
Scientific paper
10.1209/epl/i2002-00144-3
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.
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