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Andreev reflection spectroscopy in strongly paired superconductors

Cyprian Lewandowski1,2,*, Étienne Lantagne-Hurtubise1,2, Alex Thomson1,2,3,4, Stevan Nadj-Perge2,5, and Jason Alicea1,2

  • 1Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
  • 2Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
  • 3Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA
  • 4Department of Physics, University of California, Davis, California 95616, USA
  • 5T. J. Watson Laboratory of Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA

  • *clewandowski@magnet.fsu.edu
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Phys. Rev. B 107, L020502 – Published 6 January, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L020502

Abstract

Motivated by recent experiments on low-carrier-density superconductors, including twisted multilayer graphene, we study signatures of the BCS-to-BEC evolution in Andreev reflection spectroscopy. We establish that in a standard quantum point contact geometry, Andreev reflection in a BEC superconductor is unable to mediate a zero-bias conductance beyond e2/h per lead channel. This bound is shown to result from a mapping that links the subgap conductance of BCS and BEC superconductors. We then demonstrate that sharp signatures of BEC superconductivity, including perfect Andreev reflection, can be recovered by tunneling through a suitably designed potential well. We propose various tunneling spectroscopy setups to experimentally probe this recovery.

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Phys. Rev. B 107, L020502– Published 6 January, 2023
  • Received 25 July 2022
  • Revised 29 October 2022
  • Accepted 13 December 2022
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