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Microscopic model for a Brownian translator
UHasselt, Faculty of Sciences, Theory Lab, Agoralaan, 3590 Diepenbeek, Belgium.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Nordita SU.
UHasselt, Faculty of Sciences, Theory Lab, Agoralaan, 3590 Diepenbeek, Belgium.
2024 (English)In: Journal of Statistical Mechanics: Theory and Experiment, E-ISSN 1742-5468, Vol. 2024, no 4, article id 043203Article in journal (Refereed) Published
Abstract [en]

A microscopic model for a translational Brownian motor, dubbed a Brownian translator, is introduced. It is inspired by the Brownian gyrator described by Filliger and Reimann (2007 Phys. Rev. Lett. 99 230602). The Brownian translator consists of a spatially asymmetric object moving freely along a line due to perpetual collisions with a surrounding ideal gas. When this gas has an anisotropic temperature, both spatial and temporal symmetries are broken and the object acquires a nonzero drift. Onsager reciprocity implies the opposite phenomenon, that is dragging a spatially asymmetric object into an (initially at) equilibrium gas induces an energy flow that results in anisotropic gas temperatures. Expressions for the dynamical and energetic properties are derived as a series expansion in the mass ratio (of gas particle vs. object). These results are in excellent agreement with molecular dynamics simulations.

Place, publisher, year, edition, pages
Institute of Physics , 2024. Vol. 2024, no 4, article id 043203
Keywords [en]
Brownian motion, kinetic theory of gases and liquids, stochastic particle dynamics, transport properties
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-346395DOI: 10.1088/1742-5468/ad3199ISI: 001207478500001Scopus ID: 2-s2.0-85191347583OAI: oai:DiVA.org:kth-346395DiVA, id: diva2:1857589
Note

QC 20240516

Available from: 2024-05-14 Created: 2024-05-14 Last updated: 2024-07-04Bibliographically approved

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Eichhorn, Ralf

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