Evidence for photoinduced sliding of the charge-order condensate in La\(_{1.875}\)Ba\(_{0.125}\)CuO\(_4\)

We use femtosecond resonant soft x-ray scattering to measure the ultrafast optical melting of charge-order correlations in La\(_{1.875}\)Ba\(_{0.125}\)CuO\(_4\). By analyzing both the energy-resolved and energy-integrated order parameter dynamics, we find evidence of a short-lived nonequilibrium sta...

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Bibliographic Details
Published in:arXiv.org 2019-11
Main Authors: Mitrano, Matteo, Lee, Sangjun, Husain, Ali A, Zhu, Minhui, Gilberto de la Peña Munoz, Sun, Stella X -L, Young Il Joe, Reid, Alexander H, Wandel, Scott F, Coslovich, Giacomo, Schlotter, William, Tim van Driel, Schneeloch, John, Gu, G D, Goldenfeld, Nigel, Abbamonte, Peter
Format: Article
Language:English
Subjects:
Charge density waves
Condensates
Doppler effect
Order parameters
Sliding
Soft x rays
X-ray scattering
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Summary:We use femtosecond resonant soft x-ray scattering to measure the ultrafast optical melting of charge-order correlations in La\(_{1.875}\)Ba\(_{0.125}\)CuO\(_4\). By analyzing both the energy-resolved and energy-integrated order parameter dynamics, we find evidence of a short-lived nonequilibrium state, whose features are compatible with a sliding charge density wave coherently set in motion by the pump. This transient state exhibits shifts in both the quasielastic line energy and its wave vector, as expected from a classical Doppler effect. The wave vector change is indeed found to directly follow the pump propagation direction. These results demonstrate the existence of sliding charge order behavior in an unconventional charge density wave system and underscore the power of ultrafast optical excitation as a tool to coherently manipulate electronic condensates.
ISSN:2331-8422
DOI:10.48550/arxiv.1911.08037