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

MPS-Authors
/persons/resource/persons252343

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;

/persons/resource/persons182604

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);

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2106.09446.pdf
(Preprint), 3MB

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Citation

Kornich, V., Schlawin, F., Sentef, M. A., & Trauzettel, B. (2021). Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy.


Cite as: http://hdl.handle.net/21.11116/0000-0008-BA6E-C
Abstract
We propose a measurement scheme to directly detect odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy. The scheme includes two consecutive, non-overlapping 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 concretely analyzing the signal for the prototypical case of two-band superconductors, which are known to exhibit odd-frequency pairing under certain conditions.