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Article Dans Une Revue Nature Communications Année : 2018

Thermodynamic phases in two-dimensional active matter

Résumé

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.
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Dates et versions

hal-01950105 , version 1 (10-12-2018)

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Juliane U. Klamser, Sebastian C. Kapfer, Werner Krauth. Thermodynamic phases in two-dimensional active matter. Nature Communications, 2018, 9 (1), pp.5045. ⟨10.1038/s41467-018-07491-5⟩. ⟨hal-01950105⟩
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