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  • Letter
  • Open Access

Anomalous Fano factor as a signature of Bogoliubov Fermi surfaces

Sayan Banerjee1,2,*, Satoshi Ikegaya3,*, and Andreas P. Schnyder1,†

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 2Institute for Theoretical Physics III, University of Stuttgart, D-70550 Stuttgart, Germany
  • 3Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan

  • *These authors contributed equally to this work.
  • †a.schnyder@fkf.mpg.de
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Phys. Rev. Research 4, L042049 – Published 23 December, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L042049

Abstract

Noise spectroscopy is a key technique to investigate the nature and dynamics of charge carriers in superconductors. The recently discovered superconducting hybrids with Bogoliubov Fermi surfaces exhibit a particularly intriguing and rich charge dynamics, as their charge carriers consist of both Cooper pairs and an extensive number of Bogoliubov quasiparticles. Motivated by this, we compute the noise spectra of Bogoliubov Fermi surfaces and identify their key signatures in the differential conductance and the Fano factor. Specifically, we consider a semiconductor/superconductor hybrid device with an in-plane magnetic field, which exhibits several Bogoliubov Fermi surfaces. The number and orientation of the Bogoliubov Fermi surfaces in this device can be readily controlled by the applied magnetic field, which in turn alters the noise signal. In particular, we find that the Fano factor exhibits a reduced value, substantially lower than two, whenever the charge dynamics is governed by a large number of Bogoliubov quasiparticles. Using experimentally relevant parameters, we make a number of specific predictions for the noise spectra, that can be used as direct evidence of Bogoliubov Fermi surfaces. In particular, we find that the Fano factor as a function of magnetic field and spin-orbit coupling exhibits characteristic discontinuities at the transition lines that separate phases with different numbers of Bogoliubov Fermi surfaces.

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Phys. Rev. Research 4, L042049– Published 23 December, 2022
  • Received 11 July 2022
  • Revised 13 November 2022
  • Accepted 8 December 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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