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Proximity-induced superconductivity in a 3D topological insulator representsa new avenue for observing zero-energy Majorana fermions inside vortex cores.Relatively small gaps and low transition temperatures of conventional s-wavesuperconductors put the hard constraints on these experiments. Significantlylarger gaps and higher transition temperatures in cuprate superconductors mightbe an attractive alternative to considerably relax these constraints, but it isnot clear whether the proximity effect would be effective in heterostructuresinvolving cuprates and topological insulators. Here, we present angle-resolvedphotoemission studies of thin Bi2Se3 films grown in-situ on optimally dopedBi2Sr2CaCu2O8 substrates that show the absence of proximity-induced gaps on thesurfaces of Bi2Se3 films as thin as a 1.5 quintuple layer. These resultssuggest that the superconducting proximity effect between a cupratesuperconductor and a topological insulator is strongly suppressed, likely dueto a very short coherence length along the c-axis, incompatible crystal andpairing symmetries at the interface, small size of the topological surfacestate Fermi surface and adverse effects of a strong spin-orbit coupling in thetopological material.

Absence of a Proximity Effect in a Topological Insulator on a Cuprate Superconductor: Bi2Se3/Bi2Sr2CaCu2O8