Directed transport in a periodic tube driven by asymmetric unbiased forces coexisting with spatially modulated noises

作者：Li, Feng guo^*; Ai, Bao quan

来源：Chemical Physics, 2011, 388(1-3): 43-46.

DOI：10.1016/j.chemphys.2011.07.016

• Transport
• Asymmetric unbiased forces
• Spatially modulated noises
• Competition

Transport of Brownian particles in a symmetrically periodic tube is investigated in the presence of asymmetric unbiased external forces and spatially modulated Gaussian white noises. In the adiabatic limit, we obtain the analytical expression of the directed current. It is found that the temporal asymmetry can break thermodynamic equilibrium and induce a net current. Their competition between the temporal asymmetry force and the phase shift between the noise modulation and the tube shape will induce some peculiar phenomena, for example, current reversals. The current changes with the phase shift in the form of the sine function. For negative asymmetric parameters of the force, there exists an optimum parameter at which the current takes its maximum value. However, the current increases monotonously for positive asymmetric parameters.

• 出版日期2011-9-22
• 单位华南师范大学