Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Charge Order
TT 39.7: Vortrag
Mittwoch, 20. März 2024, 11:15–11:30, H 3025
Ultrafast dynamics in (TaSe4)2I triggered by valence and core-level excitation — •Wibke Bronsch1, Manuel Tuniz2, Giuseppe Crupi2, Michela De Col2, Denny Puntel2, Davide Soranzio2, Alessandro Giammarino2, Michele Perlangeli2, Helmuth Berger3, Dario De Angelis1, Danny Fainozzi1, Ettore Paltanin2, Stefano Pelli Cresi1, Gabor Kurdi1, Riccardo Mincigrucci1, Laura Foglia1, Fulvio Parmigiani1, Filippo Bencivenga1, and Federico Cilento1 — 1Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14, km 163.5, Trieste, Italy — 2Dipartimento di Fisica, Università degli Studi di Trieste, 34127 Trieste, Italy — 3Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Dimensionality plays a key role for the emergence of ordered phases like charge-density-waves, that in turn can couple to and modulate the topological properties of matter. In this work, we study the out-ofequilibrium dynamics of the paradigmatic quasi-one-dimensional material (TaSe4)2I, that exhibits a transition into an incommensurate charge-density-wave (CDW) phase when cooled down just below room temperature, at TCDW = 263 K. We make use of both optical laser and free-electron laser (FEL) based time-resolved spectroscopies in order to study the effect of a selective excitation of the material on the charge-density-wave phase, by probing the near-infrared/visible optical properties both along and perpendicularly to the direction of the charge-density-wave [1].
[1] W. Bronsch et al., Faraday Discuss. 237 (2022) 40.
Keywords: (TaSe4)2I; Charge Density Wave; Time-resolved optical spectroscopy; FEL