Transport properties of particles and waves in spatially periodic structures that are driven by
external time-dependent forces manifestly depend on the space–time symmetries of the …

Theoretical physics deals with physical models. The main requirements for a good physical
model are simplicity and universality. Universal models which can be applied to describe a …

Experimental observation of the unidirectional motion of a topological soliton driven by a
biharmonic ac force of zero mean is reported. The observation is made by measuring the …

The nonlinear signal mixing of two, generally incommensurate, rectangular driving forces is
used to control overdamped transport in Brownian ratchet devices. The interplay between …

The nonlinear signal mixing of two driving forces is used to control transport in overdamped
ratchet devices. The interplay between the relative phase and the frequency ratio of the two …

The mechanism underlying the soliton ratchet, both in absence and in presence of noise, is
investigated. We show the existence of an asymmetric internal mode on the soliton profile …

The rectification of a massive Brownian particle moving on a periodic substrate can be
achieved in the absence of spatial asymmetry, by having recourse to (at least) two periodic …

Transport in one-dimensional symmetric devices can be activated by the combination of
thermal noise and a biharmonic drive. For the study case of an overdamped Brownian …

Thermal noise and harmonic forcing have recently been shown to cooperatively excite sine–
Gordon breathers robust to dissipation. Such a phenomenon has been found assuming a …

We study directed energy transport in homogeneous nonlinear extended systems in the
presence of homogeneous ac forces and dissipation. We show that the mechanism …