Force-velocity relation and density profiles for biased diffusion in an adsorbed monolayer -: art. no. 235413

被引:27
作者
Bénichou, O [1 ]
Cazabat, AM
De Coninck, J
Moreau, M
Oshanin, G
机构
[1] Univ Paris 11, Lab Phys Theor & Modeles Stat, F-91405 Orsay, France
[2] Univ Paris 06, Phys Theor Liquides Lab, F-75252 Paris, France
[3] Coll France, Phys Mat Condensee Lab, F-75252 Paris 05, France
[4] Univ Mons, Ctr Rech Modelisat Mol, B-7000 Mons, Belgium
来源
PHYSICAL REVIEW B | 2001年 / 63卷 / 23期
关键词
D O I
10.1103/PhysRevB.63.235413
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the dynamics of a hard-core tracer particle (TP), performing a biased random walk in an adsorbed monolayer composed of mobile hard-core particles undergoing continuous exchanges with a vapor phase. In terms of an approximate approach, based on the decoupling of the third-order correlation functions, we obtain the density profiles of the monolayer particles around the TP, and derive the force-velocity relation, determining the TP terminal velocity V-tr as a function of the magnitude of the external bias and other system parameters. These results generalize, for the case of an arbitrary applied field, our earlier predictions [Phys. Rev. Lett. 84, 511 (2000)] obtained in the limit of a vanishingly small external bias. Asymptotic forms of the monolayer particle density profiles at large separations from the TP, and the behavior of V-tr in the limit of a small external bias, are found explicitly.
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页数:15
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