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Title:
4pi-periodic Josephson supercurrent in HgTe-based topological Josephson junctions
Authors:
Wiedenmann, J.; Bocquillon, E.; Deacon, R. S.; Hartinger, S.; Herrmann, O.; Klapwijk, T. M.; Maier, L.; Ames, C.; Brüne, C.; Gould, C.; Oiwa, A.; Ishibashi, K.; Tarucha, S.; Buhmann, H.; Molenkamp, L. W.
Affiliation:
AA(), AB(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany;), AC(Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan), AD(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AE(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AF(Kavli Institute of Nanoscience, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands; Laboratory for Quantum Limited Devices, Physics Department, Moscow State Pedagogical University, 29 Malaya Pirogovskaya Moscow 119992, Russia), AG(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AH(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AI(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AJ(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AK(The Institute of Scientific and Industrial Research, Osaka University 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan), AL(Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan), AM(Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan; Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan), AN(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany), AO(Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany)
Publication:
Nature Communications, Volume 7, id. 10303 (2016).
Publication Date:
01/2016
Origin:
NATURE
Abstract Copyright:
(c) 2016: Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
DOI:
10.1038/ncomms10303
Bibliographic Code:
2016NatCo...710303W

Abstract

The Josephson effect describes the generic appearance of a supercurrent in a weak link between two superconductors. Its exact physical nature deeply influences the properties of the supercurrent. In recent years, considerable efforts have focused on the coupling of superconductors to the surface states of a three-dimensional topological insulator. In such a material, an unconventional induced p-wave superconductivity should occur, with a doublet of topologically protected gapless Andreev bound states, whose energies vary 4pi-periodically with the superconducting phase difference across the junction. In this article, we report the observation of an anomalous response to rf irradiation in a Josephson junction made of a HgTe weak link. The response is understood as due to a 4pi-periodic contribution to the supercurrent, and its amplitude is compatible with the expected contribution of a gapless Andreev doublet. Our work opens the way to more elaborate experiments to investigate the induced superconductivity in a three-dimensional insulator.
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