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Topological superconductor is a timely and frontier topic in condensed matterphysics. In superconducting state, an order parameter will be established withthe basic or subsidiary symmetry of the crystalline lattice. In doped Bi2Se3with a basic threefold symmetry, it was predicted however thatsuperconductivity may have a twofold symmetry of odd parity. Here we report theproximity effect induced superconductivity in Bi2Te3 thin film on top of aniron-based superconductor FeTe0.55Se0.45. By using the quasiparticleinterference technique, we demonstrate clear evidence of twofold symmetry ofthe superconducting gap. The gap minimum is along one of the main crystallineaxis following the so-called Delta_4y notation. This is also accompanied by theelongated vortex shape mapped out by the density of states within thesuperconducting gap, with probably the Majorana mode within the vortex core.Our results reveal the direct evidence of superconductivity with odd parity inBi2Te3 thin film.

Direct Evidence of Superconductivity with Twofold Symmetry in Bi2Te3 Thin Film Deposited on FeTe0.55Se0.45