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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces

O 58.8: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/2OG

Simulation of spatially resolved CDW dynamics — •Kurt Lichtenberg1, Mohamad Abdo1,2, Shaoxiang Sheng1, Luigi Malavolti1,2, and Sebastian Loth1,21University 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. They can, for example, be observed as an oscillatory collective response of the material's electron system to a fast optical stimulus [1]. On the other hand, scanning probe measurements reveal highly localized interaction with atomic defects [2]. Here we developed an empirical model for one-dimensional CDWs that treats the ultrafast dynamics of a CDW in real space and at the intrinsic time scale of the CDW motion. The model is based on time-dependent Ginzburg Landau Theory and motivated by former approaches [3,4]. Simulations based on this model enable the exploration of 1D CDW systems. We see a strong dependence of the collective mode behaviour on temperature, the impurity constellation and excitation intensity.

References [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).

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