Andreev Reflection without Fermi surface alignment in High T$_{c}$-Topological heterostructures
Superconductivity
2017-05-11 v1 Strongly Correlated Electrons
Abstract
We address the controversy over the proximity effect between topological materials and high T superconductors. Junctions are produced between BiSrCaCuO and materials with different Fermi surfaces (BiTe \& 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.
Cite
@article{arxiv.1705.03518,
title = {Andreev Reflection without Fermi surface alignment in High T$_{c}$-Topological heterostructures},
author = {Parisa Zareapour and Alex Hayat and Shu Yang F. Zhao and Michael Kreshchuk and Zhijun Xu and T. S. Liu and G. D. Gu and Shuang Jia and Robert J. Cava and H. -Y. Yang and Ying Ran and Kenneth S. Burch},
journal= {arXiv preprint arXiv:1705.03518},
year = {2017}
}