Thin film junctions and bilayers of the doped topological insulator Bi2​Se3​ and the s-wave superconductor NbN were found to exhibit conductance
spectra with prominent zero bias and coherence peaks. Various tunneling models
with different pair potentials have failed to fit our data, except for the
triplet px​+ipy​ pair potential, which breaks time reversal symmetry, but
yielded reasonably good fits. This provides evidence for proximity induced
triplet superconductivity in the Bi2​Se3​ layer near the interface with
the NbN film.Comment: Accepted for publication in Europhysics Letter