Out-of-equilibrium charge redistribution in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy

Denny Puntel, Dmytro Kutnyakhov, Lukas Wenthaus, Markus Scholz, Nils O. Wind, Michael Heber, Günter Brenner, Genda Gu, Robert J. Cava, Wibke Bronsch, Federico Cilento, Fulvio Parmigiani, Federico Pressacco

Research output: Contribution to journalArticlepeer-review


Charge-transfer excitations are of paramount importance for understanding the electronic structure of copper-oxide based high-temperature superconductors. In this study, we investigate the response of a Bi2Sr2CaCu2O8+δ crystal to the charge redistribution induced by an infrared ultrashort pulse. Element-selective time-resolved core-level photoelectron spectroscopy with a high energy resolution allows disentangling the dynamics of oxygen ions with different coordination and bonds thanks to their different chemical shifts. Our experiment shows that the O 1s component arising from the Cu–O planes is significantly perturbed by the infrared light pulse. Conversely, the apical oxygen, also coordinated with Sr ions in the Sr-O planes, remains unaffected. This result highlights the peculiar behavior of the electronic structure of the Cu–O planes. It also unlocks the way to study the out-of-equilibrium electronic structure of copper-oxide-based high-temperature superconductors by identifying the O 1s core-level emission originating from the oxygen ions in the Cu–O planes. This ability could be critical to gain information about the strongly-correlated electron ultrafast dynamical mechanisms in the Cu–O plane in the normal and superconducting phases.

Original languageEnglish (US)
Article number8775
JournalScientific reports
Issue number1
StatePublished - Dec 2024

All Science Journal Classification (ASJC) codes

  • General


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