Tight coupling in thermal Brownian motors

Details Tight coupling in thermal Brownian motors Tight coupling in thermal Brownian motors

2006-09-04

arxiv.org/abs/cond-mat/0609069v1

Phys. Rev. E 74, 062102 (2006)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.74.062102

We study analytically a thermal Brownian motor model and calculate exactly the Onsager coefficients. We show how the reciprocity relation holds and that the determinant of the Onsager matrix vanishes. Such condition implies that the device is built with tight coupling. This explains why Carnot's efficiency can be achieved in the limit of infinitely slow velocities. We also prove that the efficiency at maximum power has the maximum possible value, which corresponds to the Curzon-Alhborn bound. Finally, we discuss the model acting as a Brownian refrigerator.

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