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TT: Fachverband Tiefe Temperaturen
TT 71: Many-Body Quantum Dynamics I (joint session DY/TT)
TT 71.14: Talk
Thursday, March 21, 2024, 13:00–13:15, A 151
Phase transition driven by ultrashort laser pulses in the charge-density-wave material K0.3MoO3 — •Rafael T. Winkler1,2, Larissa Boie1, Yunpei Deng2, Matteo Savoini1, Serhane Zerdane2, Abhishek Nag2, Sabina Gurung1, Davide Soranzio1, Tim Suter1, Vladimir Ovuka1, Janine Zemp-Dössegger1, 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 with a periodic lattice distortion (PLD). In a time resolved x-ray experiment at SwissFEL, 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 RSM along the surface normal gets broader at the delay equal to half the amplitude mode oscillation period, indicating a transient inversion of the PLD. For longer delays, this broadening is not visible. However, the diffracted x-ray intensity drops below the unpumped value indicating a molten CDW near the surface.
Keywords: Ultrafast Dynamics; Charge Density Wave; Time Resolved X-ray Diffraction