Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 4: Nonequilibrium Quantum Many-Body Systems 1 (joint session TT/DY)

TT 4.4: Talk

Monday, April 1, 2019, 10:15–10:30, H22

Non-equilibrium optical conductivity for the antiferromagnetic single-band Hubbard model: Time-dependent Gutzwiller analysis — •Christian Martens¹, Jörg Bünemann², and Götz Seibold¹ — ¹Institut für Physik, BTU Cottbus-Senftenberg, Postfach 101344, 03013 Cottbus, Germany — ²Fakultät Physik, TU Dortmund, 44227 Dortmund, Germany

Based on the time-dependent Gutzwiller approximation (TDGA) for the Hubbard model we analyze the optical conductivity σ(ω) in an out-of equilibrium situation for underlying antiferromagnetic ground states. The equilibrium state is perturbed by an instant quench of the local Coulomb interaction parameter U or by an electric field E(t). We analyze various shapes for the applied electric field and discuss our results with regard to the optical conductivity determination from pump-probe experiments. In the linear response regime, RPA corrections to the TDGA vanish, so that the optical response is determined by the bare current-current correlation function. In contrast, far from the linear response regime the out-of equilibrium case shows a more interesting behavior and in particular mixes double occupancy fluctuations to the current response.