Andreev Reflection without Fermi surface alignment in High T\(_{c}\)-Topological heterostructures

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\(_{8+\delta}\) and materials with different Fermi surfaces (Bi\(_{2}\)Te\(_{3}\) \& graphite). Both cases reveal...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2017-05
Main Authors: Zareapour, Parisa, Hayat, Alex, Zhao, Shu Yang F, Kreshchuk, Michael, Xu, Zhijun, Liu, T S, Gu, G D, Jia, Shuang, Cava, Robert J, H -Y Yang, Ying Ran, Burch, Kenneth S
Format: Article
Language:English
Subjects:
Brillouin zones
Cooper pairs
Doppler effect
Fermi surfaces
Heterostructures
Proximity effect (electricity)
Reflection
Superconductors
Topology
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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\(_{8+\delta}\) and materials with different Fermi surfaces (Bi\(_{2}\)Te\(_{3}\) \& graphite). Both cases reveal tunneling spectra consistent with Andreev reflection. This is confirmed by 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 the Fermi surface mis-match does not hinder the ability to form transparent interfaces, which is accounted for by the extended Brillouin zone and different lattice symmetries.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.03518