| Issue |
EPL
Volume 148, Number 3, November 2024
|
|
|---|---|---|
| Article Number | 37001 | |
| Number of page(s) | 7 | |
| Section | Biological and soft matter physics | |
| DOI | https://doi.org/10.1209/0295-5075/ad895e | |
| Published online | 13 November 2024 | |
Entropy production of active Brownian particles going from liquid to hexatic and solid phases
1 Dipartimento Interateneo di Fisica, Università degli Studi di Bari and INFN, Sezione di Bari via Amendola 173, Bari I-70126, Italy
2 School of Physics and Astronomy, University of Edinburgh - Peter Guthrie Tait Road, Edinburgh, EH9 3FD, UK
3 Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di Salerno and INFN, Gruppo Collegato di Salerno - via Giovanni Paolo II 132, I-84084 Fisciano (SA), Italy
Received: 2 September 2024
Accepted: 21 October 2024
Due to its inherent intertwinement with irreversibility, entropy production is a prime observable to monitor in systems of active particles. In this numerical study, entropy production in the liquid, hexatic and solid phases of a two-dimensional system of active Brownian particles is examined at both average and fluctuation level. The trends of averages as functions of density show no singularity and marked changes in their derivatives at the hexatic-solid transition. Distributions show instead peculiar tail structures interpreted by looking at microscopic configurations. Particles in regions of low local order generate tail values according to different dynamical mechanisms: they move towards empty regions or bounce back and forth into close neighbours. The tail structures are reproduced by a simple single-particle model including an intermittent harmonic potential.
© 2024 The author(s)
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