Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy
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 analyzing the signal for the prototypical case of a two-band superconductor.
Keywords
Cite
@article{arxiv.2106.09446,
title = {Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy},
author = {Viktoriia Kornich and Frank Schlawin and Michael A. Sentef and Björn Trauzettel},
journal= {arXiv preprint arXiv:2106.09446},
year = {2021}
}