Regensburg 2025 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Focus Session: Nonequilibrium Collective Behavior in Open Classical and Quantum Systems
DY 31.7: Vortrag
Donnerstag, 20. März 2025, 11:30–11:45, H37
Ultrafast Dynamics Across the Phase Transition of the Charge Density Wave in K0.3MoO3 — •Rafael T. Winkler1, Larissa Boie1, Yunpei Deng2, Matteo Savoini1, Serhane Zerdane2, Abhishek Nag2, Sabina Gurung1, Davide Soranzio1, Tim Suter1, Vladimir Ovuka1, Janine Zemp1, Elsa Abreu1, Simone Biasco1, Roman Mankowsky2, Edwin J Divall2, Alexander R. Oggenfuss2, Mathias Sander2, Christopher Arrell2, Danylo Babich2, Henrik T. Lemke2, Paul Beaud2, Urs Staub2, Jure Demsar3, and Steven L. Johnson1,2 — 1Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland — 2SwissFEL, Paul Scherrer Institute, Villigen, Switzerland. — 3Faculty - Institute of Physics, Johannes Gutenberg-University Mainz
Blue Bronze (K0.3MoO3) is a quasi 1D material exhibiting a charge density wave (CDW) with a periodic lattice distortion (PLD). In a time resolved x-ray experiment, we study the dynamics of the PLD by pumping K0.3MoO3 with short laser pulses and probing it using x-ray diffraction. We construct reciprocal space maps (RSM) of superlattice reflections at different delays. The RSMs indicate a transient inversion of the phase of the CDW. We attribute the suppression of the diffracted x-ray intensity after this phase inversion to a fast decoherence of the CDW driven by local pinning of the phase of the CDW in the material. These observations were confirmed by numerical simulations of the time dependent Ginzburg-Landau equations, extended by including defects which favor a particular phase of the CDW in combination with a temperature dependent coherence factor.
Keywords: Ultrafast; Time Resolved x-ray diffraction; Charge Density Wave; Ginzburg-Landau Equation; Phase Transition