Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 62: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)

TT 62.5: Talk

Wednesday, March 14, 2018, 16:15–16:30, H 3010

Non-equilibrium steady state of the ionic Hubbard model in strong electric fields — •Yusuf Mohammed¹ and Martin Eckstein² — ¹Universität Hambrug, Hamburg, Germany — ²FAU, Erlangen, Germany

We investigate the transport properties and non-equilibrium steady state phases of the dissipative ionic Hubbard model driven by an electric field. In the ionic Hubbard model, metallic behavior is enhanced by a competition of band insulating and Mott insulating behavior. The system is analyzed by means of the inhomogeneous dynamical mean-field theory (DMFT), using the iterated perturbation theory as impurity solver. The steady states of this model are accessed directly through the Keldysh contour formalism. We found that with increasing electric field the sublattice polarization reduces, leading to a decrease in the screening of the gap and an increase in the electronic scattering rate. This results in a smaller current in the nonlinear regime of correlated ionic insulators compared the non interacting case. In addition, we observed a quasi-thermal distributions even in the negative differential resistance regime, due to electron-electron scattering.