Andreev reflection without Fermi surface alignment in high-T cvan der Waals heterostructures

Parisa Zareapour, Alex Hayat, Shu Yang F. Zhao, Michael Kreshchuk, Zhijun Xu, T. S. Liu, G. D. Gu, Shuang Jia, Robert J. Cava, H. Y. Yang, Ying Ran, Kenneth S. Burch

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We address the controversy over the proximity effect between topological materials and high-T c superconductors. Junctions are produced between Bi2Sr2CaCu2O and materials with different Fermi surfaces (Bi2Te3 and graphite). Both cases reveal tunneling spectra that are consistent with Andreev reflection. This is confirmed by a magnetic field that shifts features via the Doppler effect. This is modeled with a single parameter that accounts for tunneling into a screening supercurrent. Thus the tunneling involves Cooper pairs crossing the heterostructure, showing that the Fermi surface mismatch does not hinder the ability to form transparent interfaces, which is accounted for by the extended Brillouin zone and different lattice symmetries.

Original languageEnglish (US)
Article number043026
JournalNew Journal of Physics
Issue number4
StatePublished - Apr 2017

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


  • Andreev reflecti
  • high-T superconductors
  • topological materials


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