Integrable Mott insulators driven by a finite electric field.
We develop a method for extracting the steady nonequilibrium current from studies of driven isolated systems, applying it to the model of a one-dimensional Mott insulator at high temperatures. While in the nonintegrable model the nonequilibrium conditions can be accounted for by internal heating, the integrability leads to a strongly nonlinear dc response with a vanishingly small dc conductivity in the linear-response regime. The finding is consistent with equilibrium results for the dc limit of the optical conductivity determined in the presence of a weak and decreasing perturbation.
Institute of Physics, University of Silesia, 40-007 Katowice, Poland.
Marcin
M
Mierzejewski
Janez
J
Bonča
Peter
P
Prelovšek