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We observe proximity-induced superconductivity in the \textit{in situ}prepared heterostructures constructed by topological insulator Bi$_{2}$Te$_{3}$thin films and high-temperature cuprate superconductorsBi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$. The superconducting gap maximum isabout 7.6 meV on the surface of Bi$_{2}$Te$_{3}$ thin films with a thickness oftwo quintuple layers, and the gap value decreases with an increase in the filmthickness. Moreover, the quasiparticle interference data show a clear evidenceof a twofold symmetric superconducting gap with gap minima along one pair ofthe principal crystalline axes of Bi$_{2}$Te$_{3}$. This gap form is consistentwith the $\Delta_{4y}$ notation of the topological superconductivity proposedin such systems. Our results provide fruitful information of the possibletopological superconductivity induced by the proximity effect inhigh-temperature superconducting cuprates.

physical review. b./physical review. b

Twofold symmetry of proximity-induced superconductivity in  Bi$_{2}$Te$_{3}$/Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ heterostructures  revealed by scanning tunneling microscopy