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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 66.6: Vortrag

Mittwoch, 18. März 2015, 16:15–16:30, H 2053

Even-odd flux quanta effect in the Fraunhofer oscillations of an edge-channel Josephson junction — •Benjamin Baxevanis, Viacheslav Ostroukh, and Carlo Beenakker — Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands

We calculate the beating of h/2e and h/e periodic oscillations of the flux-dependent critical supercurrent through a quantum spin-Hall insulator between two superconducting electrodes [1]. A conducting pathway along the superconductor connects the helical edge channels via a non-helical channel, allowing an electron incident on the superconductor along one edge to be Andreev reflected along the opposite edge. We find the appearance of Fraunhofer oscillations with an even-odd effect: Large peaks in the critical current at even multiples of h/2e alternate with smaller peaks at odd multiples. This even-odd effect has been recently observed in one series of experiments by Pribiag et al. [2].

[1] B. Baxevanis et al. arXiv:1411.6638

[2] V.S. Pribiag et al. arXiv:1408.1701