Transformation of dynamical fluctuation into coherent energy

Details Transformation of dynamical fluctuation into coherent energy Transformation of dynamical fluctuation into coherent energy

1998-01-15

arxiv.org/abs/cond-mat/9801151v1

Physics

Condensed Matter

Soft Condensed Matter

3 pages, 2 figures; submitted to Phys. Rev. Lett

Scientific paper

10.1143/JPSJ.67.1818

Studies of noise-induced motions are showing that coherent energy can be extracted from some kinds of noise in a periodic ratchet. Recently, energetics of Langevin dynamics is formulated by Sekimoto [J.Phys.Soc.Jpn, 66 1234 (1997)], which can be applied to ratchet systems described by Fokker-Planck equation. In this paper, we derive an energetics of ratchet systems that can be applied to dynamical-noise-induced motion in a static potential. Analytical efficiency of the energy transformation is derived for the dynamical noise in an overdumping limit of the system. Comparison between analytical and numerical studies is performed for chaotic noise.

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