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첨단연성물질 연구단
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An experimentally-achieved information-driven Brownian motor shows maximum power at the relaxation time

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Title
An experimentally-achieved information-driven Brownian motor shows maximum power at the relaxation time
Author(s)
Dong Yun Lee; Jaegon Um; Govind Paneru; Hyuk Kyu Pak
Publication Date
2018-08
Journal
SCIENTIFIC REPORTS, v.8, no.1, pp.12121 -
Publisher
NATURE PUBLISHING GROUP
Abstract
We present an experimental realization of an information-driven Brownian motor by periodically cooling a Brownian particle trapped in a harmonic potential connected to a single heat bath, where cooling is carried out by the information process consisting of measurement and feedback control. We show that the random motion of the particle is rectified by symmetry-broken feedback cooling where the particle is cooled only when it resides on the specific side of the potential center at the instant of measurement. Studying how the motor thermodynamics depends on cycle period tau relative to the relaxation time tau(B) of the Brownian particle, we find that the ratcheting of thermal noise produces the maximum work extraction when tau >= 5 tau(B) while the extracted power is maximum near tau= tau(B), implying the optimal operating time for the ratcheting process. In addition, we find that the average transport velocity is monotonically decreased as tau increases and present the upper bound for the velocity © The Author(s) 2018
URI
https://pr.ibs.re.kr/handle/8788114/5211
ISSN
2045-2322
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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