We study a class of two-dimensional models of classical hard-core particles with Vicsek type
“exchange interaction” that aligns the directions of motion of nearby particles. By extending …

We study a 2D Hamiltonian fluid made of particles carrying spins coupled to their velocities.
At low temperatures and intermediate densities, this conservative system exhibits phase …

We consider a class of nonstandard, two-dimensional Hamiltonian models that may show
features of active particle dynamics, and therefore, we refer to these models as active …

We study long-range order in two dimensions where an order parameter is advected by
linear laminar flows. The linear laminar flows include three classes: rotational, shear, and …

We study the effect of particle mobility on phase transitions in a spin fluid in two dimensions.
The presence of a phase transition of the BKT universality class is shown in an off-lattice …

The past years saw a rising interest in classical magnets with two-dimensional unit spins
moving in two spatial dimensions. That interest is partially due to the fact that such mobile …

Collective motion, the spontaneous ordering of the velocities across a macroscopic system,
is a hallmark of living systems like flocks of birds. It is captured by models of self-propelled …