Quasiparticle interference as a direct experimental probe of bulk odd-frequency superconducting pairing

Abstract

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.

Revised version contains additional results on a different spin symmetry of the Cooper pairs in the Supplemental Material

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Cited by in corpus (4)

• Controllable odd-frequency Cooper pairs in multi-superconductor Josephson junctions
• Odd-frequency pairing due to Majorana and trivial Andreev bound states
• Spin-Polarized Josephson Supercurrent in Nodeless Altermagnets
• Identification of odd-frequency superconducting pairing in Josephson junctions