Signatures of a 4 π -periodic supercurrent in the voltage response of capacitively shunted topological Josephson junctions

This work was supported by the Spanish Ministry of Economy and Competitiveness via Grant No. MAT2014- 58241-P and the Youth European Initiative together with the Community of Madrid, Exp. PEJ15/IND/AI-0444. F.D. acknowledges financial support from the DFG via Grant No. SFB 1170 “ToCoTronics,” the Land of Bavaria (Institute for Topological Insulators and the Elitenetzwerk Bayern), the German Research Foundation DFG (Grant No. SPP 1666).