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

Year: 2017
Type: article
Abstract: We address the controversy over the proximity effect between topological materials and high- T c superconductors. Junctions are produced between Bi 2 Sr 2 CaCu 2 O and materials with different Fermi surfaces (Bi 2 Te 3 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.
DOI: 10.1088/1367-2630/aa6b8a
Authors: 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
Language: English
Open Access status: gold
Estimated APC paid: $2,610
Funders: National Science Foundation, U.S. Department of Energy, University of Toronto, Natural Sciences and Engineering Research Council of Canada, Division of Materials Research, Brookhaven National Laboratory
Awards: G1055875721, G132563423, G1336448005, G1572106353, G338944111, Princeton Center for Complex Materials, G5292656900, High Temperature, Topological Superconductivity via the Proximity Effect, G969889393
OpenAlex ID: W2605182003
FWCI:
Cites: 76
Cited by: 4
Related to: 10