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Title: Andreev reflection without Fermi surface alignment in high- T c van der Waals heterostructures

We address the controversy over the proximity effect between topological materials and high-T c superconductors. Junctions are produced between Bi 2Sr 2CaCu 2O$${}_{8+\delta }$$ and materials with different Fermi surfaces (Bi 2Te 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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ;  [5] ;  [5] ;  [5]
  1. Univ. of Toronto, ON (Canada)
  2. Univ. of Toronto, ON (Canada); Harvard Univ., Cambridge, MA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Princeton Univ., NJ (United States)
  5. Boston College, Chestnut Hill, MA (United States)
Publication Date:
Report Number(s):
BNL-114174-2017-JA
Journal ID: ISSN 1367-2630; R&D Project: PO010; KC0201060; TRN: US1702227
Grant/Contract Number:
SC0012704
Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 4; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1437710
Alternate Identifier(s):
OSTI ID: 1389230