Quantum spin Hall-superconductor hybrids are promising sources of topological superconductivity and Majorana modes, particularly given recent progress on HgTe and InAs/GaSb. We propose a new method of revealing topological superconductivity in extended quantum spin Hall Josephson junctions supporting `fractional Josephson currents'. Specifically, we show that as one threads magnetic flux between the superconductors, the critical current traces an interference pattern featuring sharp fingerprints of topological superconductivity---even when noise spoils parity conservation.
@article{arxiv.1403.2747,
title = {Revealing topological superconductivity in extended quantum spin Hall Josephson junctions},
author = {Shu-Ping Lee and Karen Michaeli and Jason Alicea and Amir Yacoby},
journal= {arXiv preprint arXiv:1403.2747},
year = {2014}
}