Phase ordering of charge density waves traced by ultrafast low-energy electron 
diffraction

Vogelgesang, S.; Storeck, G.; Horstmann, J.G.; Diekmann, T.; Sivis, M.; Schramm, S.; Rossnagel, K.; Schäfer, S.; Ropers, Claus

doi:10.1038/nphys4309

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Phase ordering of charge density waves traced by ultrafast low-energy electron diffraction

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Ropers, Claus
Department of Ultrafast Dynamics, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Vogelgesang, S., Storeck, G., Horstmann, J., Diekmann, T., Sivis, M., Schramm, S., et al. (2018). Phase ordering of charge density waves traced by ultrafast low-energy electron diffraction. Nature Physics, 14(2), 184-190. doi:10.1038/nphys4309.

Cite as: https://hdl.handle.net/21.11116/0000-000B-5E05-7

Abstract

We introduce ultrafast low-energy electron diffraction (ULEED) in backscattering for the study of structural dynamics at surfaces. Using a tip-based source of ultrashort electron pulses, we investigate the optically driven transition between charge density wave phases at the surface of 1T-TaS2. The large transfer width of the instrument allows us to employ spot-profile analysis, resolving the phase-ordering kinetics in the nascent incommensurate charge density wave phase. We observe a coarsening that follows a power-law scaling of the correlation length, driven by the annihilation of dislocation-type topological defects of the charge-ordered lattice. Our work opens up the study of a wide class of structural transitions and ordering phenomena at surfaces and in low-dimensional systems.