title: Hawking radiation and nonequilibrium quantum critical current noise.
abstract: The dynamical scaling of quantum critical systems in thermal equilibrium may be inherited in the driven steady state, leading to universal out-of-equilibrium behavior. This attractive notion has been demonstrated in just a few cases. We demonstrate how holography-a mapping between the quantum critical system and a gravity dual-provides an illuminating perspective and new results. Nontrivial out-of-equilibrium universality is particularly apparent in current noise, which is dual to Hawking radiation in the gravitational system. We calculate this in a two-dimensional system driven by a strong in-plane electric field and deduce a universal scaling function interpolating between previously established equilibrium and far-from-equilibrium current noise. Since this applies at all fields, out-of-equilibrium experiments no longer require very high fields for comparison with theory.
authors.affiliation: DAMTP, University of Cambridge, United Kingdom and Imperial College London, London, United Kingdom. js499@cam.ac.uk
authors.forename: Julian
authors.initials: J
authors.lastname: Sonner
authors.forename: A G
authors.initials: AG
authors.lastname: Green