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We study the effect of contact hyperfine interaction on the nuclear spindiffusion coefficients in semiconductor quantum dots. The diffusioncoefficients are calculated with both the method of moment and density matrix.We show that nuclear spin diffusion is strongly suppressed by the nonuniformhyperfine coupling resulting from the confined electron wavefunction. Ourresults agree with the observed suppression of nuclear spin diffusion in thesestructures in recent experiments, and clarify the degree of validity of themethod of moment in an inhomogeneous system.Comment: 7 pages, 4 figure

Nuclear spin diffusion in quantum dots: Effects of inhomogeneous hyperfine interaction