Regensburg 2019 – wissenschaftliches Programm
O 45.4: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
Analysis of the Excited State Potential Energy Surface of an Ultrafast Charge-Density-Wave-to-Metal Transition — •J. Maklar1, W. Windsor1, C. Nicholson1, V. Esposito2, P. Walmsley3, M. Puppin1, E. Bothschafter2, M. Porer2, J. Rittmann2, D. Leuenberger4, M. Kubli5, M. Savoini5, E. Abreu5, S. Johnson5, I. Fisher3, P. Beaud2, G. Ingold2, U. Staub2, R. Ernstorfer1, M. Wolf1, and L. Rettig1 — 1Fritz-Haber-Institiut der Max-Planck-Gesellschaft, Berlin, Deutschland — 2SLS, Paul Scherrer Institut, Villigen, Schweiz — 3GLAM, Department of Applied Physics, Stanford, California, USA — 4Department of Physics, Univ. Zürich, Schweiz — 5Inst. für Quantenelektronik, ETH Zürich, Schweiz
Charge-density-waves (CDWs) exhibit a fascinating broken-symmetry ground state due to their intertwining with high-Tc superconductivity, their competition with Mott physics, and their interaction with magnetism. In this study we investigate the electronic and structural dynamics of the prototypical 2D CDW compound TbTe3 using XUV time-resolved ARPES and time-resolved X-ray diffraction. We observe a CDW-to-metal transition concomitant with a strongly fluence-dependent coherent oscillatory behavior of the electronic band gap and a simultaneous suppression of the periodic lattice distortion. Based on a Ginzburg-Landau-type approach we discuss how to extract the excited state energy potential of the order parameter and how to access the coupling strengths between different degrees of freedom on a quantitative level.