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VOLUME 52 (1990) | ISSUE 5 | PAGE 894
Random walk in disordered systems with dipole-dipole interactions: diffusion coefficient
A new method is proposed for calculating diffusion coefficients. The method involves a restructuring of the series expansion of the propagator in powers of the concentration. This series converges only poorly at long times. The leading approximation for D and the first correction to it are calculated. The result agrees well with the exciton diffusion coefficient which has been measured previously by optical four-wave mixing.