Dynamical anomalies and structural features of Active Brownian Particles characterised by two repulsive length scales

Abstract

In this work we study a two-dimensional system composed by Active Brownian Particles (ABPs) interacting via a repulsive potential with two-length-scales, a soft shell and a hard-core. Depending on the ratio between the strength of the soft shell barrier and the activity, we find two regimes: If this ratio is much larger or smaller than 1, the observed behaviour is comparable with ABPs interacting via a single length-scale potential. If this ratio is similar to 1, the two length-scales are relevant for both structure and dynamical properties. On the structural side, when the system exhibits a motility induced phase separation, the dense phase is characterised by new and more complex structures compared with the hexatic phase observed in single length-scale systems. On the dynamical side, as far as we are aware, this is the first representation of an anomalous dynamics in active particles.

References in corpus (11)

• Active matter
• Spontaneous velocity alignment in Motility-induced Phase Separation
• Nonequilibrium equation of state in suspensions of active colloids
• Thermodynamics and Dynamics of the Two-Scale Spherically-Symmetric Jagla Model of Anomalous Liquids
• Water-like hierarchy of anomalies in a continuous spherical shouldered potential
• Metastable liquid-liquid coexistence and density anomalies in a core-softened fluid
• Relationship between thermodynamics and dynamics of supercooled liquids
• How active forces influence nonequilibrium glass transitions
• Characterization of MIPS in a suspension of repulsive Active Brownian Particles through dynamical features
• Molecular dynamics computer simulation of amorphous silica under high pressure
• Static Structure of Active Brownian Hard Disks

Cited by in corpus (4)

• Solid-amorphous transition is related to the waterlike anomalies in a fluid without liquid-liquid phase transition
• Re-entrant percolation in active Brownian hard disks
• Percolation transitions in the binary mixture of active Brownian particles with different softness
• Effective interactions in active Brownian particles