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Efficiency Fluctuations in Microscopic Machines
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Rekke forfattare: 42019 (engelsk)Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, nr 14, artikkel-id 140601Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Nanoscale machines are strongly influenced by thermal fluctuations, contrary to their macroscopic counterparts. As a consequence, even the efficiency of such microscopic machines becomes a fluctuating random variable. Using geometric properties and the fluctuation theorem for the total entropy production, a universal theory of efficiency fluctuations at long times, for machines with a finite state space, was developed by Verley et al. [Nat. Commun. 5, 4721 (2014); Phys. Rev. E 90, 052145 (2014)]. We extend this theory to machines with an arbitrary state space. Thereby, we work out more detailed prerequisites for the universal features and explain under which circumstances deviations can occur. We also illustrate our findings with exact results for two nontrivial models of colloidal engines.

sted, utgiver, år, opplag, sider
2019. Vol. 122, nr 14, artikkel-id 140601
HSV kategori
Forskningsprogram
teoretisk fysik
Identifikatorer
URN: urn:nbn:se:su:diva-168343DOI: 10.1103/PhysRevLett.122.140601ISI: 000463902800004OAI: oai:DiVA.org:su-168343DiVA, id: diva2:1314405
Tilgjengelig fra: 2019-05-08 Laget: 2019-05-08 Sist oppdatert: 2020-05-05bibliografisk kontrollert
Inngår i avhandling
1. Non-equilibrium thermodynamics at the microscopic scales
Åpne denne publikasjonen i ny fane eller vindu >>Non-equilibrium thermodynamics at the microscopic scales
2020 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

An inherent feature of small systems in contact with thermal reservoirs, be it a pollen grain in water, or an active microbe flagellum, is fluctuations. Even with advanced microscopic techniques, distinguishing active, non-equilibrium processes defined by a constant dissipation of energy to the environment from passive, equilibrium processes is a very challenging task and a vastly developing field of research. For small (microscopic) systems in contact with thermal reservoirs, the experimental / theoretic framework that addresses these fundamental questions, is called stochastic thermodynamics.

In this thesis, we study the stochastic thermodynamics of microscopic machines with colloidal particles as working substances. In particular, we use a path integral based framework to characterize the fluctuations of thermodynamic observables, such as Work, Heat and Entropy production in colloidal heat engines. We obtain exact analytic solutions at finite operational times and the results reveal model independent features of Work and Efficiency fluctuations.

We also discuss the thermodynamic uncertainty relations, which relate current fluctuations in non-equilibrium steady states to the average rate of entropy production. Based on this relation, as well as exact analytical solutions for explicit models, we propose a simple and effective way to infer dissipation from current fluctuations in non-equilibrium systems, from short empirical trajectories.

Finally, we conclude with a discussion on possible extensions of our results.

sted, utgiver, år, opplag, sider
Stockholm: Department of Physics, Stockholm University, 2020. s. 86
Emneord
Non-equilibrium statistical Physics, entropy production
HSV kategori
Forskningsprogram
teoretisk fysik
Identifikatorer
urn:nbn:se:su:diva-181029 (URN)978-91-7911-174-8 (ISBN)978-91-7911-175-5 (ISBN)
Disputas
2020-06-15, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2020-05-19 Laget: 2020-04-24 Sist oppdatert: 2020-05-25bibliografisk kontrollert

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