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Using Andreev reflection (AR) as an experimental gauge of the superconductingproximity effect (PE), we assess the topological purity of thesuperconductivity that is induced by the c-axis PE between an s-wavesuperconductor and the topological insulators Bi$_{2}$X$_{3}$ (X=Se,Te).Point-contact AR spectroscopy is performed with Nb tips on Bi$_{2}$X$_{3}$single crystals at 4.2 K. Scanning tunneling spectroscopy is also used, tolocate the Fermi level $E_F$ relative to the Dirac point in the crystals. TheAR data is analyzed with Blonder-Tinkham-Klapwijk theory, taking into accounttip-induced spin-orbit coupling, Fermi-surface mismatch, and the co-presence ofbulk band and topological surface states at $E_F$. Our results indicate thatthe superconductivity that can be proximity-induced into Bi$_{2}$X$_{3}$ ispredominantly non-topological.

Andreev reflection spectroscopy on Bi$_{2}$X$_{3}$ (X = Se, Te) topological insulators: Implications for the c-axis superconducting proximity effect