Induced unconventional superconductivity on the surface states of Bi2Te3 topological insulator
Research output: Contribution to journal › Article › Scientific › peer-review
Details
Original language | English |
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Article number | 2019 |
Pages (from-to) | 1-8 |
Journal | Nature Communications |
Volume | 8 |
Issue number | 1 |
Publication status | Published - 1 Dec 2017 |
MoE publication type | A1 Journal article-refereed |
Researchers
Research units
- Chalmers University of Technology
- University of Latvia
- CAS - Shanghai Institute of Microsystem and Information Technology
- University of Naples Federico II
- SPIN Genova
- Norwegian University of Science and Technology
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.
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