Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Thermodynamic phases in two-dimensional active matter


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

External Resource
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)

(Preprint), 10MB

Supplementary Material (public)
There is no public supplementary material available

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.

Cite as: https://hdl.handle.net/21.11116/0000-0002-BA7F-F
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.