Print Email Facebook Twitter Dissipation-enabled fractional Josephson effect Title Dissipation-enabled fractional Josephson effect Author Sticlet, D.C. (TU Delft QN/Akhmerov Group; Kavli institute of nanoscience Delft; National Institute for Research and Development of Isotopic and Molecular Technologies) Sau, Jay D. (University of Maryland) Akhmerov, A.R. (TU Delft QN/Akhmerov Group; Kavli institute of nanoscience Delft) Date 2018 Abstract The anomalous 4π-periodic ac Josephson effect, a hallmark of topological Josephson junctions, was experimentally observed in a quantum spin Hall insulator. This finding is unexpected due to time-reversal symmetry preventing the backscattering of the helical edge states and therefore suppressing the 4π-periodic component of the Josephson current. Here, we analyze the two-particle inelastic scattering as a possible explanation for this experimental finding. We show that a sufficiently strong inelastic scattering restores the 4π-periodic component of the current beyond the short Josephson junction regime. Its signature is an observable peak in the power spectrum of the junction at half the Josephson frequency. We propose to use the exponential dependence of the peak width on the applied bias and the magnitude of the dc current as means of verifying that the inelastic scattering is indeed the mechanism responsible for the 4π-periodic signal. To reference this document use: http://resolver.tudelft.nl/uuid:3062921b-cdda-4400-9657-80704acb8666 DOI https://doi.org/10.1103/PhysRevB.98.125124 ISSN 2469-9950 Source Physical Review B, 98 (12) Part of collection Institutional Repository Document type journal article Rights © 2018 D.C. Sticlet, Jay D. Sau, A.R. Akhmerov Files PDF PhysRevB.98.125124.pdf 1.36 MB Close viewer /islandora/object/uuid:3062921b-cdda-4400-9657-80704acb8666/datastream/OBJ/view