Thermodynamic phases in two-dimensional active matter

Juliane U. Klamser, Sebastian C. Kapfer and Werner Krauth ()
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Juliane U. Klamser: CNRS
Sebastian C. Kapfer: Max-Planck-Institut für Physik komplexer Systeme
Werner Krauth: CNRS

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-07491-5

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