Abstract
We establish a nonequilibrium scaling regime in the short-time evolution of one-dimensional interacting open quantum systems subject to a generic heating mechanism. This dynamical regime is characterized by uncompensated phonon production and a superdiffusive, universal scaling of quasiparticle lifetimes with momentum , distinct from the finite- and zero-temperature cases. It is separated from a high-momentum regime by a time-dependent scale fading out as . In the latter region we observe thermalization to an effective time-dependent equilibrium with linearly increasing temperature. By mapping out the dynamical phase diagram and computing the dynamical structure factor within an open-system Keldysh functional integral approach, we show how these predictions can be explored in cold-atom experiments by means of Bragg spectroscopy.
- Received 14 January 2015
DOI:https://doi.org/10.1103/PhysRevA.92.013603
©2015 American Physical Society