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

Viktoriia Kornich; Frank Schlawin; Michael A. Sentef; Björn Trauzettel

doi:10.1103/PhysRevResearch.3.L042034

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

Viktoriia Kornich, Frank Schlawin, Michael A. Sentef, Björn Trauzettel

DOI 10.1103/PhysRevResearch.3.L042034 · Physical Review Research

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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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Formula	Reported Tc (K)	Pressure (GPa)	Type
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown