{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T09:53:47Z","timestamp":1776851627358,"version":"3.51.2"},"reference-count":28,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2023,1,10]],"date-time":"2023-01-10T00:00:00Z","timestamp":1673308800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"MUR (Italian Ministry of University)","award":["PRIN201798CZLJ"],"award-info":[{"award-number":["PRIN201798CZLJ"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>The motion of a Brownian particle in the presence of Coulomb friction and an asymmetric spatial potential was evaluated in this study. The system exhibits a ratchet effect, i.e., an average directed motion even in the absence of an external force, induced by the coupling of non-equilibrium conditions with the spatial asymmetry. Both the average motion and the fluctuations of the Brownian particle were analysed. The stationary velocity shows a non-monotonic behaviour as a function of both the temperature and the viscosity of the bath. The diffusion properties of the particle, which show several time regimes, were also investigated. To highlight the role of non-linear friction in the dynamics, a comparison is presented with a linear model of a Brownian particle driven by a constant external force, which allows for analytical treatment. In particular, the study unveils that the passage times between different temporal regimes are strongly affected by the presence of Coulomb friction.<\/jats:p>","DOI":"10.3390\/sym15010200","type":"journal-article","created":{"date-parts":[[2023,1,10]],"date-time":"2023-01-10T01:57:48Z","timestamp":1673315868000},"page":"200","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Diffusion Properties of a Brownian Ratchet with Coulomb Friction"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8273-4232","authenticated-orcid":false,"given":"Massimiliano","family":"Semeraro","sequence":"first","affiliation":[{"name":"Dipartimento Interateneo di Fisica, Universit\u00e0 degli Studi di Bari and INFN, Sezione di Bari, Via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giuseppe","family":"Gonnella","sequence":"additional","affiliation":[{"name":"Dipartimento Interateneo di Fisica, Universit\u00e0 degli Studi di Bari and INFN, Sezione di Bari, Via Amendola 173, 70126 Bari, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1444-1889","authenticated-orcid":false,"given":"Eugenio","family":"Lippiello","sequence":"additional","affiliation":[{"name":"Dipartimento di Matematica e Fisica, Universit\u00e0 della Campania \u201cLuigi Vanvitelli\u201d, 81100 Caserta, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3686-0822","authenticated-orcid":false,"given":"Alessandro","family":"Sarracino","sequence":"additional","affiliation":[{"name":"Dipartimento di Ingegneria, Universit\u00e0 della Campania \u201cLuigi Vanvitelli\u201d, 81031 Aversa, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"387","DOI":"10.1103\/RevModPhys.81.387","article-title":"Artificial Brownian motors: Controlling transport on the nanoscale","volume":"81","author":"Marchesoni","year":"2009","journal-title":"Rev. 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