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Thermodynamic phases in two-dimensional active matter

MPG-Autoren
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Krauth,  Werner
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

Externe Ressourcen
Volltexte (frei zugänglich)

1802.10021.pdf
(Preprint), 10MB

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Zitation

Klamser, J. U., Kapfer, S. C., & Krauth, W. (2018). Thermodynamic phases in two-dimensional active matter. Nature Communications, 9: 5045. doi:10.1038/s41467-018-07491-5.


Zitierlink: http://hdl.handle.net/21.11116/0000-0002-BA7F-F
Zusammenfassung
Active matter has been much studied for its intriguing properties such as collective motion, motility-induced phase separation and giant fluctuations. However, it has remained unclear how the states of active materials connect with the equilibrium phases. For two-dimensional systems, this is also because the understanding of the liquid, hexatic, and solid equilibrium phases and their phase transitions is recent. Here we show that two-dimensional self-propelled point particles with inverse-power-law repulsions moving with a kinetic Monte Carlo algorithm without alignment interactions preserve all equilibrium phases up to very large activities. Furthermore, at high activity within the liquid phase, a critical point opens up a gas-liquid motility-induced phase separation region. In our model, two-step melting and motility-induced phase separation are thus independent phenomena. We discuss the reasons for these findings to be common to a wide class of two-dimensional active systems.