Regensburg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 78: Plasmonics and Nanooptics 3
O 78.8: Vortrag
Freitag, 9. September 2022, 12:15–12:30, H3
A Ginzburg Landau model for femtosecond charge-density wave dynamics at the atomic scale — •Kurt Lichtenberg1, Mohamad Abdo1,2, Shaoxiang Sheng1, Luigi Malavolti1,2, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany
Charge-density waves (CDWs) feature collective excitations that can be observed as an oscillatory response of the electron system of a material to a fast optical stimulus [1]. At the same time, scanning tunneling microscopy (STM) measurements reveal highly localized interactions with atomic defects [2]. THz pump-probe spectroscopy in the STM reveals highly heterogeneous dynamics with spatial variations down one unit cell of the CDW. To improve the understanding of such local CDW dynamics, we developed an empirical model that is motivated by former approaches [3,4] and based on time-dependent Ginzburg Landau Theory. The combination of this theory with THz-STM measurements establishes a possibility to study the interplay between collective CDW dynamics with atomic pinning sites.
[1] M.-A. Méasson et. al, PRB 89, 060503(R) (2014)
[2] C. J. Arguello et. al, PRB 89, 235115 (2014)
[3] W. L. McMillan, PRB 12, 1187-1196 (4) (1975).
[4] G. Grüner, Density Waves in Solids. Perseus Publishing - Cambridge, Massachusetts, (2000).