Induced unconventional superconductivity on the surface states of Bi2Te3 topological insulator

Sophie Charpentier, Luca Galletti, Gunta Kunakova, Riccardo Arpaia, Yuxin Song, Reza Baghdadi, Shu Min Wang, Alexei Kalaboukhov, Eva Olsson, Francesco Tafuri, Dmitry Golubev, Jacob Linder, Thilo Bauch and Floriana Lombardi ()
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Sophie Charpentier: Chalmers University of Technology
Luca Galletti: Chalmers University of Technology
Gunta Kunakova: Chalmers University of Technology
Riccardo Arpaia: Chalmers University of Technology
Yuxin Song: Chalmers University of Technology
Reza Baghdadi: Chalmers University of Technology
Shu Min Wang: Chalmers University of Technology
Alexei Kalaboukhov: Chalmers University of Technology
Eva Olsson: Chalmers University of Technology
Francesco Tafuri: Università di Napoli Federico II
Dmitry Golubev: Aalto University School of Science
Jacob Linder: Norwegian University of Science and Technology
Thilo Bauch: Chalmers University of Technology
Floriana Lombardi: Chalmers University of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Topological superconductivity is central to a variety of novel phenomena involving the interplay between topologically ordered phases and broken-symmetry states. The key ingredient is an unconventional order parameter, with an orbital component containing a chiral p x + ip y wave term. Here we present phase-sensitive measurements, based on the quantum interference in nanoscale Josephson junctions, realized by using Bi2Te3 topological insulator. We demonstrate that the induced superconductivity is unconventional and consistent with a sign-changing order parameter, such as a chiral p x + ip y component. The magnetic field pattern of the junctions shows a dip at zero externally applied magnetic field, which is an incontrovertible signature of the simultaneous existence of 0 and π coupling within the junction, inherent to a non trivial order parameter phase. The nano-textured morphology of the Bi2Te3 flakes, and the dramatic role played by thermal strain are the surprising key factors for the display of an unconventional induced order parameter.

Date: 2017
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DOI: 10.1038/s41467-017-02069-z

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