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Extreme timescale core-level spectroscopy with tailored XUV pulses

MPG-Autoren
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Singla,  Rashmi
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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D.,  Haynes
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Grguraš,  I.
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Class 5 Photonics GmbH;

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Schulz,  S.
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Deutsches Elektronen-Synchrotron DESY;

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Liu,  Haiyun
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Simoncig,  A.
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Elettra Sincrotrone Trieste SCpA;

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Tellkamp,  F.
Machine Physics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Cavalieri,  A. L.
Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Zitation

Singla, R., D., H., Hanff, K., Grguraš, I., Schulz, S., Liu, H., et al. (2018). Extreme timescale core-level spectroscopy with tailored XUV pulses.


Zusammenfassung
A new approach for few-femtosecond time-resolved photoelectron spectroscopy in condensed matter that balances the combined needs for both temporal and energy resolution is demonstrated. Here, the method is designed to investigate a prototypical Mott insulator, tantalum disulphide (1T-TaS2), which transforms from its charge-density-wave ordered Mott insulating state to a conducting state in a matter of femtoseconds. The signature to be observed through the phase transition is a charge-density-wave induced splitting of the Ta 4f core-levels, which can be resolved with sub-eV spectral resolution. Combining this spectral resolution with few-femtosecond time resolution enables the collapse of the charge ordered Mott state to be clocked. Precise knowledge of the sub-20-femtosecond dynamics will provide new insight into the physical mechanism behind the collapse and may reveal Mott physics on the timescale of electronic hopping.