Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 48: Ultrafast Electron Dynamics III (joint session O/MA)
MA 48.5: Talk
Thursday, March 19, 2020, 11:30–11:45, WIL B321
Time-resolved Momentum Microscopy of an Ultrafast Charge-Density-Wave-to-Metal Transition — •Julian Maklar1, Shuo Dong1, Samuel Beaulieu1, Tommaso Pincelli1, Maciej Dendzik1, Philip Walmsley2, Ian Fisher2, Ralph Ernstorfer1, Martin Wolf1, and Laurenz Rettig1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Deutschland — 2GLAM, Department of Applied Physics, Stanford, California, USA
Complex solids exhibit a multitude of competing and intertwined orders. A promising approach to disentangle relevant interactions and energy scales is by perturbation via ultrafast photoexcitation. However, this requires tracking of the electronic structure upon photoexcitation across a large energy and momentum range with femtosecond (fs) time-resolution in order to capture all relevant electronic processes.
Here, we investigate the evolution of the electronic band structure of the prototypical 2D charge-density-wave (CDW) compound TbTe3 after photo-excitation. We utilize a new method, i.e. XUV time-resolved momentum microscopy, to simultaneously map a large energy- and momentum region with 40 fs temporal resolution. This allows us to identify collective excitations of the CDW as well as a strong coupling to a distinct phonon mode across multiple Brillouin zones.