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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. Johnson1,21Institute 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

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