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Portrait of Heiner Linke; Photo: Kennet Ruona

Heiner Linke

Professor, Deputy dean at Faculty of Engineering, LTH

Portrait of Heiner Linke; Photo: Kennet Ruona

Molecular motor efficiency is maximized in the presence of both power-stroke and rectification through feedback

Author

  • Regina Schmitt
  • J. M. R. Parrondo
  • Heiner Linke
  • Jonas Johansson

Summary, in English

We present a model for a feedback-controlled ratchet consisting of a Brownian particle and a moving, finite barrier that is shifted by an external agent depending on the position of the particle. By modifying the value of a single parameter of the feedback protocol, the model can act either as a pure rectifier, a power-stroke (PS) motor, or a combination of both. Interestingly, in certain situations the motor reaches a maximum efficiency for an intermediate value of that parameter, i.e., for a combination of the information ratchet and the PS mechanisms. We relate our results to the biological motors kinesin, myosin II, and myosin V, finding that these motors operate in a regime of length scales and forces where the efficiency is maximized for a combination of rectification and PS mechanisms.

Department/s

  • Solid State Physics
  • NanoLund

Publishing year

2015

Language

English

Publication/Series

New Journal of Physics

Volume

17

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Condensed Matter Physics

Keywords

  • molecular motor
  • Brownian ratchet
  • power-stroke
  • rectification of
  • fluctuations
  • efficiency
  • Shannon entropy
  • Brownian recitifier

Status

Published

ISBN/ISSN/Other

  • ISSN: 1367-2630