Unveiling odd-frequency pairing around a magnetic impurity in a superconductor
Abstract
We study the unconventional superconducting correlations caused by a single isolated magnetic impurity in a conventional s-wave superconductor. Due to the local breaking of time-reversal symmetry, the impurity induces unconventional superconductivity which is even in both space and spin variables but odd under time inversion. We derive an exact proportionality relation between the even-frequency component of the local electron density of states and the imaginary part of the odd-frequency local pairing function. By applying this relation to scanning tunneling microscopy spectra taken on top of magnetic impurities immersed in a Pb/Si(111) monolayer, we show experimental evidence of the occurrence of the odd-frequency pairing in these systems and explicitly extract its superconducting function from the data.
Keywords
Cite
@article{arxiv.1912.11241,
title = {Unveiling odd-frequency pairing around a magnetic impurity in a superconductor},
author = {Vivien Perrin and Flavio L. N. Santos and Gerbold C. Ménard and Christophe Brun and Tristan Cren and Marcello Civelli and Pascal Simon},
journal= {arXiv preprint arXiv:1912.11241},
year = {2020}
}
Comments
6 pages, 3 figures, revised version