# Dresden 2017 – wissenschaftliches Programm

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# O: Fachverband Oberflächenphysik

## O 68: Focus Session: Non-equilibrium Dynamics in Light-driven Materials: Theory Meets Experiment

### O 68.3: Hauptvortrag

### Mittwoch, 22. März 2017, 11:30–12:00, TRE Phy

**Controlling magnetism and pairing in a periodically driven Hubbard model** — •Stephen Clark^{1,2}, Jonathan Coulthard^{3}, Juan Jose Mendoza-Arenas^{4}, Martin Eckstein^{2}, Dieter Jaksch^{3}, and Andrea Cavalleri^{2,3} — ^{1}Department of Physics, University of Bath, UK — ^{2}Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — ^{3}Department of Physics, University of Oxford, UK — ^{4}Departamento de Fisica, Universidad de los Andes, Colombia

In this talk I will describe theory work illustrating striking effects of periodic driving for three different regimes: (i) high frequency ω ≫ *U*,*t*, (ii) resonant ω = *nU* and (iii) in-gap *U* ≫ ω ≫ *t*. Floquet theory when *U* ≫ *t* predicts renormalisation of *t* for (i), substantial modifications of both *t* and *U* for (ii) and a suppression of *t* with super-exchange *J* essentially unchanged for (iii). To demonstrate this physics I will outline non-equilibrium DMFT results showing how the mechanism governing the magnetic melting of an initial classical Neel state can be controlled and switched in the half-filled Hubbard model in infinite dimensions. I will also describe how attaining dominant super-exchange interactions in regime (iii) leads to the emergence of strong singlet-pairing correlations in the driven state. This is demonstrated in the one-dimensional Hubbard model below half-filling in the thermodynamic limit using time-dependent DMRG calculations. By spanning different fillings, dimensions and driving regimes these results show how periodic driving leads to compelling new pathways for controlling magnetism and potentially engineering light-induced superconductivity.