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Topological superconductivity is central to a variety of novel phenomenainvolving the interplay between topologically ordered phases andbroken-symmetry states. The key ingredient is an unconventional orderparameter, with an orbital component containing a chiral $p_x$ + i$p_y$ waveterm. Here we present phase-sensitive measurements, based on the quantuminterference in nanoscale Josephson junctions, realized by using Bi$_2$Te$_3$topological insulator. We demonstrate that the induced superconductivity isunconventional and consistent with a sign-changing order parameter, such as achiral $p_x$ + i$p_y$ component. The magnetic field pattern of the junctionsshows a dip at zero externally applied magnetic field, which is anincontrovertible signature of the simultaneous existence of 0 and $\pi$coupling within the junction, inherent to a non trivial order parameter phase.The nano-textured morphology of the Bi$_2$Te$_3$ flakes, and the dramatic roleplayed by thermal strain are the surprising key factors for the display of anunconventional induced order parameter.

Induced unconventional superconductivity on the surface states of Bi$_2$Te$_3$ topological insulator