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  • Letter
  • Open Access

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

Viktoriia Kornich1, Frank Schlawin2,3, Michael A. Sentef2, and Björn Trauzettel1

  • 1Institut für Theoretische Physik and Astrophysik, Universität Würzburg, 97074 Würzburg, Germany
  • 2Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science (CFEL), Luruper Chaussee 149, 22761 Hamburg, Germany
  • 3The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany

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Phys. Rev. Research 3, L042034 – Published 3 December, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L042034

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 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.

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Outline

Information

Phys. Rev. Research 3, L042034– Published 3 December, 2021
  • Received 17 June 2021
  • Revised 29 October 2021
  • Accepted 2 November 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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