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Diffusive motion of C60 on a graphene sheet
, Article Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 82, Issue 5 , November , 2010 ; 15393755 (ISSN) ; Abedpour, N ; Rasuli, S. N ; Naji, A ; Ejtehadi, M. R ; Sharif University of Technology
2010
Abstract
The motion of a C60 molecule over a graphene sheet at finite temperature is investigated both theoretically and computationally. We show that a graphene sheet generates a van der Waals laterally periodic potential, which directly influences the motion of external objects in its proximity. The translational motion of a C60 molecule near a graphene sheet is found to be diffusive in the lateral directions, while in the perpendicular direction, the motion may be described as diffusion in an effective harmonic potential which is determined from the distribution function of the position of the C60 molecule. We also examine the rotational diffusion of C 60 and show that its motion over the graphene...
Anderson localization and propagation of electromagnetic waves through disordered media
, Article Waves in Random and Complex Media ; Volume 20, Issue 1 , 2010 , Pages 191-200 ; 17455030 (ISSN) ; Abedpour, N ; Sepehrinia, R ; Niry, M. D ; Reza Rahimi Tabar, M ; Sahimi, M ; Sharif University of Technology
2010
Abstract
We have used the dynamic method to calculate the frequency dependence of the localization length in a disordered medium, using the amplitude change and the redshift of the spectral density of the propagating incident pulse. The frequency dependence of the localization length in an effectively one-dimensional disordered medium is computed in terms of the strength of the disorder. The results obtained with the dynamic method are confirmed by computing the same results using the transfer-matrix method