We show that quasiparticle interference (QPI) due to omnipresent weak impurities and probed by Fourier transform scanning tunneling microscopy and spectroscopy acts as a direct experimental probe of bulk odd-frequency superconducting pairing. Taking the example of a conventional s-wave superconductor under applied magnetic field, we show that the nature of the QPI peaks can only be characterized by including the odd-frequency pairing correlations generated in this system. In particular, we identify that the defining feature of odd-frequency pairing gives rise to a bias asymmetry in the QPI, present generically in materials with odd-frequency pairing irrespective of its origin.
@article{arxiv.2204.11880,
title = {Quasiparticle interference as a direct experimental probe of bulk odd-frequency superconducting pairing},
author = {Debmalya Chakraborty and Annica M. Black-Schaffer},
journal= {arXiv preprint arXiv:2204.11880},
year = {2023}
}
Comments
Revised version contains additional results on a different spin symmetry of the Cooper pairs in the Supplemental Material