Abstract
We study the appearance and properties of cluster crystals (solids in which the unit cell is occupied by a cluster of particles) in a two-dimensional system of self-propelled active Brownian particles with repulsive interactions. Self-propulsion deforms the clusters by depleting particle density inside, and for large speeds it melts the crystal. Continuous field descriptions at several levels of approximation allow us to identify the relevant physical mechanisms.
Highlights
The collective behavior of self-propelled particles is a fascinating topic both for its numerous applications and its intrinsic theoretical interest [1,2,3,4]
Many studies focused on the formation of clusters reporting two main different cases: for ‘active crystals’, self-propulsion leads to a modification of the properties of a pre-existing crystal that is usually induced by long-range attractive and short-range repulsive interactions [5,6,7]
For Mobility-Induced Phase Separation (MIPS), the system separates into two fluid phases of different densities
Summary
IFISC (CSIC-UIB), Instituto de Física Interdisciplinary Sistemas Complejos, Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain. ACCEPTED FOR PUBLICATION Keywords: clustering, emergence of patterns, active matter, self-propelling particles, non-equilibrium statistical mechanics
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