Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Dynamics in Many-Body Systems: Interference, Equilibration and Localization II (joint session DY/TT)
TT 31.3: Vortrag
Montag, 12. März 2018, 16:00–16:15, EB 107
Photo-carrier relaxation of correlated band insulators — •Nagamalleswara Rao Dasari1 and Martin Eckstein2 — 1Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. — 2Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany.
Ionic band insulators are characterized by charge gap, which is given by staggered Ionic potential (Δ). Electronic correlations (U) in these insulators screens the charge gap and makes it smaller than the spin gap. Such correlated band insulators are realized by using simplest model Hamiltonian, i.e., Ionic Hubbard model. In this work, we have studied Ionic Hubbard model in the weak coupling limit by using non-equilibrium dynamical mean-field theory and iterated perturbation theory as an impurity solver. We find that photo-excited correlated band insulators thermalize rapidly when local coulomb interaction is greater than or equal to staggered Ionic potential (U>=Δ). However, in the opposite case where U<Δ, photo-excited system relaxes to a non-thermal steady state, and we did not see the thermalization of this state in our simulation time.