Non-equilibrium dynamics of disordered fractal spring network with active forces

Abstract

We investigate the non-equilibrium dynamics of active bead-spring critical percolation clusters under the action of monopolar and dipolar forces. Previously, Langevin dynamics simulations of Rouse-type dynamics were performed on a deterministic fractal -- the Sierpinski gasket -- and combined with analytical theory [Chaos {\bf 34}, 113107 (2024)]. To study disordered fractals, we use here the critical (bond) percolation infinite cluster of square and triangular lattices, where beads (occupying nodes) are connected by harmonic springs. Two types of active stochastic forces, modeled as random telegraph processes, are considered: force monopoles, acting on individual nodes in random directions, and force dipoles, where extensile or contractile forces act between pairs of nodes, forming dipole links. A dynamical steady state is reached where the network is dynamically swelled for force monopoles. The time-averaged mean square displacement (MSD) shows sub-diffusive behavior at intermediate times longer than the force correlation time, whose anomalous exponent is solely controlled by the spectral dimension $(d_s)$ of the fractal network yielding MSD $\sim t^{\nu}$, with $\nu=1-\frac{d_s}{2}$, similar to the thermal system and in accord with the general analytic theory. In contrast, dipolar forces require a diverging time to reach a steady state, depending on the fraction of dipoles, and lead to network shrinkage. Within a quasi-steady-state assumption, we find a saturation behavior at the same temporal regime. Thereafter, a second ballistic-like rise is observed for networks with a low fraction of dipole forces, followed by a linear, diffusive increase. The second ballistic rise is, however, absent in networks fully occupied with force dipoles. These two behaviors are argued to result from local rotations of nodes, which are either persistent or fluctuating.