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 68.1: Hauptvortrag

Mittwoch, 22. März 2017, 10:30–11:00, TRE Phy

Electronic orders in light-driven materials — •Philipp Werner1, Yuta Murakami1, Hugo Strand1, Shintaro Hoshino2, and Martin Eckstein31Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland — 2RIKEN Center for Emergent Matter Science, Wako, 351-0198 Saitama, Japan — 3Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, 22761 Hamburg, Germany

The prospect of nonequilibrium control of material properties has caught the interest of the condensed matter community. In particular, recent experiments demonstrating a light-enhanced superconducting-like state in cuprates and fulleride compounds has triggered a number of theoretical studies on order parameter dynamics in lattice systems perturbed by periodic driving or strong quasi-static fields.

Here, we use the nonequilibrium dynamical mean field theory in a Kadanoff-Baym and Floquet implementation to address some relevant issues which have been ignored in previous studies. In particular, we will consider parametric phonon driving in the Holstein model, and show that the nonthermal energy distribution in the driven state generically leads to a weakening of the superconducting order.

As a second example, we will discuss order parameter switching by quasi-static electric fields in fulleride compounds. Here, we will focus on the Jahn-Teller metal phase, which has recently been identified as an orbital-selective Mott state. Electric field pulses can switch this composite ordered state between physically distinct realizations, which may be potentially exploited in ultrafast persistent memory devices.

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