Thermal noise can facilitate energy transformation in the presence of entropic barriers
arXiv:0712.1282 · doi:10.1103/PhysRevE.75.061126
Abstract
Efficiency of a Brownian particle moving along the axis of a three-dimensional asymmetric periodic channel is investigated in the presence of a symmetric unbiased force and a load. Reduction of the spatial dimensionality from two or three physical dimensions to an effective one-dimensional system entails the appearance of entropic barriers and an effective diffusion coefficient. The energetics in the presence of entropic barriers exhibits peculiar behavior which is different from that occurring through energy barriers. We found that even on the quasistatic limit there is a regime where the efficiency can be a peaked function of temperature, which indicates that thermal noise can facilitate energy transformation, contrary to the case of energy barriers. The appearance of entropic barriers may induce optimized efficiency at a finite temperature.
arXiv comment14 pages, 7 figures
References in corpus (18)
- Kinetic Equations for Diffusion in the Presence of Entropic Barriers
- Entropic transport: Kinetics, scaling and control mechanisms
- Chaotic Transport and Current Reversal in Deterministic Ratchets
- Energy Transduction of Isothermal Ratchets: Generic Aspects and Specific Examples Close to and Far from Equilibrium
- Voltage rectification by a SQUID ratchet
- Biased diffusion in confined media: Test of the Fick-Jacobs approximation and validity criteria
- Correlated noise in a logistic growth model
- Lateral Separation of Macromolecules and Polyelectrolytes in Microlithographic Arrays
- Complementarity relation for irreversible process derived from stochastic energetics
- Current in a three-dimensional periodic tube with unbiased forces
- Ratchet Effect in Surface Electromigration: Smoothing Surfaces by an ac Field
- Energetics of Forced Thermal Ratchet
- Thermal Noise Can Facilitate Energy Conversion by Ratchet System?
- Efficiency optimization in a correlation ratchet with asymmetric unbiased fluctuations
- Motion in a rocked ratchet with spatially periodic friction
- Efficiency and Current in a correlated ratchet
- Stochastic Energetics of Quantum Transport
- Energetics of rocked inhomogeneous ratchets