Stefano Iubini - CBM-CNRS Orleans #
A boundary-induced transition in chains of coupled oscillators #
A novel class of nonequilibrium phase-transitions at zero temperature is 
found in chains of nonlinear oscillators.
For two paradigmatic systems, the Hamiltonian XY model and the discrete 
nonlinear Schroedinger equation, we find that
the application of boundary forces induces two synchronized phases, 
separated by a non-trivial interfacial region
where the kinetic temperature is finite.
Dynamics in such supercritical state displays anomalous chaotic 
properties whereby some observables are
non-extensive and transport is superdiffusive.
At finite temperatures, the transition is smoothed out, but it still 
induces peculiar properties such as a non-monotonous
temperature-profile in the presence of equal-temperature heat baths.