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Thermodynamic phases in two-dimensional active matter

Author

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  • Juliane U. Klamser

    (CNRS
    Max-Planck-Institut für Physik komplexer Systeme)

  • Sebastian C. Kapfer

    (Max-Planck-Institut für Physik komplexer Systeme
    FAU Erlangen-Nürnberg)

  • Werner Krauth

    (CNRS
    Max-Planck-Institut für Physik komplexer Systeme
    The University of Tokyo)

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.

Suggested Citation

  • Juliane U. Klamser & Sebastian C. Kapfer & Werner Krauth, 2018. "Thermodynamic phases in two-dimensional active matter," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07491-5
    DOI: 10.1038/s41467-018-07491-5
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    Cited by:

    1. William E. Arter & Runzhang Qi & Nadia A. Erkamp & Georg Krainer & Kieran Didi & Timothy J. Welsh & Julia Acker & Jonathan Nixon-Abell & Seema Qamar & Jordina Guillén-Boixet & Titus M. Franzmann & Dav, 2022. "Biomolecular condensate phase diagrams with a combinatorial microdroplet platform," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Zafer, Aytürk Hamdi & Akguc, Gursoy B., 2022. "Feedback and reactive flow effects on living crystal formation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 587(C).
    3. Yuan Shen & Ingo Dierking, 2022. "Electrically tunable collective motion of dissipative solitons in chiral nematic films," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    4. Lukas Hecht & Iris Dong & Benno Liebchen, 2024. "Motility-induced coexistence of a hot liquid and a cold gas," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    5. Qianhong Yang & Maoqiang Jiang & Francesco Picano & Lailai Zhu, 2024. "Shaping active matter from crystalline solids to active turbulence," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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