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Driven Anisotropic Diffusion at Boundaries: Noise Rectification and Particle Sorting
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0002-2738-867X
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 6, article id 060603Article in journal (Refereed) Published
Abstract [en]

We study the diffusive dynamics of a Brownian particle in the proximity of a flat surface under nonequilibrium conditions, which are created by an anisotropic thermal environment with different temperatures being active along distinct spatial directions. By presenting the exact time-dependent solution of the Fokker-Planck equation for this problem, we demonstrate that the interplay between anisotropic diffusion and hard-core interaction with the plain wall rectifies the thermal fluctuations and induces directed particle transport parallel to the surface, without any deterministic forces being applied in that direction. Based on current micromanipulation technologies, we suggest a concrete experimental setup to observe this novel noise-induced transport mechanism. We furthermore show that it is sensitive to particle characteristics, such that this setup can be used for sorting particles of different sizes.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 119, no 6, article id 060603
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-243516DOI: 10.1103/PhysRevLett.119.060603ISI: 000407445800002PubMedID: 28949644Scopus ID: 2-s2.0-85027830458OAI: oai:DiVA.org:kth-243516DiVA, id: diva2:1287151
Funder
Swedish Research Council, 621-2012-2982 621-2013-3956 638-2013-9243
Note

QC 20190208

Available from: 2019-02-08 Created: 2019-02-08 Last updated: 2019-02-08Bibliographically approved

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Bo, Stefano

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