Induced unconventional superconductivity on the surface states of Bi2Te3 topological insulator
Artikel i vetenskaplig tidskrift, 2017
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 px + ipy 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 pi 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.
bi2se3
symmetry
strain
edge
junctions
thin-films
Författare
Sophie Charpentier
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
luca galletti
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Gunta Kunakova
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Riccardo Arpaia
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Yuxin Song
Chalmers, Mikroteknologi och nanovetenskap, Fotonik
Reza Baghdadi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Shu Min Wang
Chalmers, Mikroteknologi och nanovetenskap, Fotonik
Alexei Kalaboukhov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Eva Olsson
Chalmers, Fysik, Eva Olsson Group
Francesco Tafuri
Superconductors, oxides and other innovative materials and devices
Universita degli Studi di Napoli Federico II
Dmitry Golubev
Aalto-Yliopisto
Jacob Linder
Norges teknisk-naturvitenskapelige universitet
Thilo Bauch
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Floriana Lombardi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 8 1 2019Ämneskategorier
Fysik
Den kondenserade materiens fysik
DOI
10.1038/s41467-017-02069-z
PubMed
29222507