Josephson Junctions in Topological Crystalline Insulators

In this talk I will report on the properties of Josephson junctions fabricated with weak links of the topological crystalline insulator SnTe. Unexpectedly, these junctions exhibit anomalous DC and AC Josephson effects and magnetic diffraction patterns. The anomalies observed are consistent with a current-phase relation which breaks time reversal symmetry. The origin of this effect will be elucidated, demonstrating how the combination of the multiband proximity effect and the low-temperature ferroelectric distortion give rise to the observed time reversal symmetry breaking. Finally, I will discuss the importance of our results for the generation of Majorana bound states in superconducting topological crystalline insulators.