Efficiency of Molecular Machines with Continuous Phase Space

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  • Natalia Golubeva, Denmark
  • Alberto Imparato
  • Luca Peliti, Dipartimento di Scienze Fisiche and Sezione INFN, Universit` “Federico II”, Italy
We consider a molecular machine described as a Brownian particle diffusing in a tilted periodic potential. We evaluate the absorbed and released power of the machine as a function of the applied molecular and chemical forces, by using the fact that the times for completing a cycle in the forward and the backward direction have the same distribution, and that the ratio of the corresponding splitting probabilities can be simply expressed as a function of the applied force. We explicitly evaluate the efficiency at maximum power for a simple sawtooth potential. We also obtain the efficiency at maximum power for a broad class of 2-D models of a Brownian machine and find that loosely coupled machines operate with a smaller efficiency at maximum power than their strongly coupled counterparts.
Original languageEnglish
JournalEPL
Volume97
Issue6
Pages (from-to)60005
Number of pages6
ISSN0295-5075
DOIs
Publication statusPublished - 22 Mar 2012

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