TY - JOUR

T1 - Fluctuation-induced transport of two coupled particles: Effect of the interparticle interaction

AU - Yurii A, Makhnovskii

AU - Rozenbaum, Viktor M

AU - Sheu, Sheh-Yi

AU - Yang, Dah-Yen

AU - Trakhtenberg, Leonid I.

AU - Lin, Sheng Hsien

PY - 2014/6/7

Y1 - 2014/6/7

N2 - We consider a system of two coupled particles fluctuating between two states, with different interparticle interaction potentials and particle friction coefficients. An external action drives the interstate transitions that induces reciprocating motion along the internal coordinate x (the interparticle distance). The system moves unidirectionally due to rectification of the internal motion by asymmetric friction fluctuations and thus operates as a dimeric motor that converts input energy into net movement. We focus on how the law of interaction between the particles affects the dimer transport and, in particular, the role of thermal noise in the motion inducing mechanism. It is argued that if the interaction potential behaves at large distances as x(alpha), depending on the value of the exponent a, the thermal noise plays a constructive (alpha > 2), neutral (alpha = 2), or destructive (alpha < 2) role. In the case of alpha = 1, corresponding piecewise linear potential profiles, an exact solution is obtained and discussed in detail. (C) 2014 AIP Publishing LLC.

AB - We consider a system of two coupled particles fluctuating between two states, with different interparticle interaction potentials and particle friction coefficients. An external action drives the interstate transitions that induces reciprocating motion along the internal coordinate x (the interparticle distance). The system moves unidirectionally due to rectification of the internal motion by asymmetric friction fluctuations and thus operates as a dimeric motor that converts input energy into net movement. We focus on how the law of interaction between the particles affects the dimer transport and, in particular, the role of thermal noise in the motion inducing mechanism. It is argued that if the interaction potential behaves at large distances as x(alpha), depending on the value of the exponent a, the thermal noise plays a constructive (alpha > 2), neutral (alpha = 2), or destructive (alpha < 2) role. In the case of alpha = 1, corresponding piecewise linear potential profiles, an exact solution is obtained and discussed in detail. (C) 2014 AIP Publishing LLC.

KW - BROWNIAN MOTORS; MOLECULAR MOTORS; CONSTRUCTIVE ROLE; RATCHET; MOTION; NOISE; MODEL; TRANSLOCATION; FRICTION; KINESIN

U2 - 10.1063/1.4880416

DO - 10.1063/1.4880416

M3 - Article

C2 - 24907991

VL - 140

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 21

M1 - 214108

ER -