Induced unconventional superconductivity on the surface states of Bi${}_2$Te${}_3$ topological insulator

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 $p_x$ + i$p_y$ wave term. Here we present phase-sensitive measurements, based on the quantum interference in nanoscale Josephson junctions, realized by using Bi${}_2$Te${}_3$ topological insulator. We demonstrate that the induced superconductivity is unconventional and consistent with a sign-changing order parameter, such as a chiral $p_x$ + i$p_y$ 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 $\pi$ coupling within the junction, inherent to a non trivial order parameter phase. The nano-textured morphology of the Bi${}_2$Te${}_3$ flakes, and the dramatic role played by thermal strain are the surprising key factors for the display of an unconventional induced order parameter.

arXiv comment47 pages, 7 figures in the main text and 12 figures in the supplementary material

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• Topological insulator nanoribbon Josephson junctions: evidence for size effect in transport properties
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• Possible nodeless $s^{\pm }$-wave superconductivity in twisted bilayer graphene
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• Implementation of single-qubit gates via parametric modulation in the Majorana transmon
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• p-wave superfluidity in mixtures of ultracold Fermi and spinor Bose gases
• Theory of Josephson Current on a Magnetically Doped Topological Insulator
• Influence of disorder on antidot vortex Majorana states in 3D topological insulators
• Intrinsic dissipation in superconducting junctions probed by qubit spectroscopy
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• Exploring Structural and Electronic Properties of Topological Insulator/Graphene Nano-heterostructures
• Scalable Gate-Defined Majorana Fermions in 2D p-Wave Superconductors
• Theory of reentrant superconductivity in Corbino Josephson junctions