Title: Andreev Reflection without Fermi surface alignment in High T$_{c}$-Topological heterostructures,
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$_{8+\delta}$ 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.