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Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy

MPG-Autoren
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Schlawin,  F.
Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science (CFEL);
The Hamburg Centre for Ultrafast Imaging;

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Sentef,  M. A.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science (CFEL);

Externe Ressourcen

https://arxiv.org/abs/2106.09446
(Preprint)

https://dx.doi.org/10.1103/PhysRevResearch.3.L042034
(Verlagsversion)

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PhysRevResearch.3.L042034.pdf
(Verlagsversion), 737KB

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Zitation

Kornich, V., Schlawin, F., Sentef, M. A., & Trauzettel, B. (2021). Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy. Physical Review Research, 3: L042034. doi:10.1103/PhysRevResearch.3.L042034.


Zitierlink: https://hdl.handle.net/21.11116/0000-0008-BA6E-C
Zusammenfassung
We propose a measurement scheme to directly detect odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy. The scheme includes two consecutive nonoverlapping probe pulses applied to a superconducting sample. The photoemitted electrons are collected in a momentum-resolved fashion. Correlations between signals with opposite momenta are analyzed. Remarkably, these correlations are directly proportional to the absolute square of the time-ordered anomalous Green's function of the superconductor. This setup allows for the direct detection of the “hidden order parameter” of odd-frequency pairing. We illustrate this general scheme by analyzing the signal for the prototypical case of a two-band superconductor.