Flocking, as paradigmatically exemplified by birds, is the coherent collective motion of active
agents. As originally conceived, flocking emerges through alignment interactions between …

We study the collective vibrational excitations of crystals under out-of-equilibrium steady
conditions that give rise to entropy production. Their excitation spectrum comprises …

Understanding actual transport mechanisms of self-propelled particles (SPPs) in complex
elastic gels—such as in the cell cytoplasm, in in vitro networks of chromatin or of F-actin …

Some nonequilibrium systems exhibit anomalous suppression of the large-scale density
fluctuations, so-called hyperuniformity. Recently, hyperuniformity was found numerically in a …

We investigate the interplay between chirality and confinement induced by the presence of
an external potential. For potentials having radial symmetry, the circular character of the …

Using Brownian vibrators, we investigated the structures and dynamics of quasi-2d granular
materials, with packing fractions (ϕ) ranging from 0.111 to 0.832. Our observations revealed …

While the collective dynamics of spherical active Brownian particles is relatively well
understood by now, the much more complex dynamics of nonspherical active particles still …

In recent years, active Brownian particles have emerged as a prominent model system for
comprehending the behaviors of active matter, wherein particles demonstrate self-propelled …

The vibrational dynamics of solids is described by phonons constituting basic collective
excitations in equilibrium crystals. Here, we consider a non-equilibrium active solid, formed …

We present a comprehensive numerical study of the phase behavior and dynamics of a
three-dimensional active dumbbell system with attractive interactions. We demonstrate that …