SINGLE-PARTICLE DIFFUSION-COEFFICIENT ON SURFACES WITH EHRLICH-SCHWOEBEL BARRIERS

The diffusion coefficient of single particles in the presence of Ehrli ch-Schwoebel barriers (ESBs) is considered. An exact expression is giv en for the diffusion coefficient on linear chains with disordered arra ngements of the ESBs. This expression is applied to the usual ESBs, wh ere the previous result for the ordered case is recovered, acid to a m ore complicated form of ESBs. The results are extended to surfaces hav ing ESBs with uniform extension in one or both directions. All results are verified by Monte Carlo simulations. (C) 1998 Elsevier Science B. V. All rights reserved.