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

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

2002-06-24

arxiv.org/abs/cond-mat/0206459v1

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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