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.

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

References in corpus (31)

• Topological Insulators
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• New directions in the pursuit of Majorana fermions in solid state systems
• Search for Majorana fermions in superconductors
• Topological Superconductivity and Superfluidity
• Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices
• Induced Superconductivity in the Quantum Spin Hall Edge
• Josephson supercurrent through a topological insulator surface state
• Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors
• Chiral P-Wave Order in Sr_2RuO_4
• Gate-tuned normal and superconducting transport at the surface of a topological insulator
• Quasiparticle States near the Surface and the Domain Wall in a p_x\pm i p_y-Wave Superconductor
• Andreev bound states in high-$T_c$ superconducting junctions
• Edge-mode Superconductivity in a Two Dimensional Topological Insulator
• 0-pi Josephson tunnel junctions with ferromagnetic barrier
• Theoretical investigation of the evolution of the topological phase of Bi${}_2$Se${}_3$ under mechanical strain
• Non-sinusoidal current-phase relationship in Josephson junctions from the 3D topological insulator HgTe
• Symmetry Protected Josephson Supercurrents in Three-Dimensional Topological Insulators
• Evidence for an anomalous current phase relation in topological insulator Josephson junctions
• Proximity-induced unconventional superconductivity in topological insulators
• Axion topological field theory of topological superconductors
• Strain engineering Dirac surface states in heteroepitaxial topological crystalline insulator thin films
• Helical Andreev bound states and superconducting Klein tunneling in topological insulator Josephson junctions
• Quantum interference and supercurrent in multiple-barrier proximity structures
• Influence of Topological Edge States on the Properties of Al/Bi2Se3/Al Hybrid Josephson Devices
• Anomalous Supercurrent from Majorana States in Topological Insulator Josephson Junctions
• Suppressing twin formation in Bi2Se3 thin films
• Charge transport in InAs nanowire Josephson junctions
• STM imaging of a bound state along a step on the surface of the topological insulator Bi${}_2$Te${}_3$
• Theory of Josephson effect in chiral p-wave superconductor / diffusive normal metal / chiral p-wave superconductor junctions
• Geometric dependence of Nb-Bi${}_2$Te${}_3$-Nb topological Josephson junction transport parameters

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• Topological insulator nanoribbon Josephson junctions: evidence for size effect in transport properties
• Quantum Transport and Potential of Topological States for Thermoelectricity in Bi${}_2$Te${}_3$ Thin Films
• High transparency Bi2Se3 topological insulator nanoribbon Josephson junctions with low resistive noise properties
• Possible nodeless $s^{\pm }$-wave superconductivity in twisted bilayer graphene
• Classifying induced superconductivity in atomically thin Dirac-cone materials
• Josephson Effect and Charge Distribution in Thin Bi${}_2$Te${}_3$ Topological Insulators
• Superconducting proximity effect in $d$-wave cuprate/ graphene heterostructures
• Low-damage electron beam lithography for nanostructures on Bi${}_2$Te${}_3$-class topological insulator thin films
• Revealing intrinsic superconductivity of the Nb/BiSbTe${}_2$Se interface
• Joule heating effects in high transparency Josephson junctions
• Microscopic theory of the current-voltage characteristics of Josephson tunnel junctions
• Quasiparticle interference in doped topological insulators with nematic superconductivity
• Unusual Superconducting Proximity Effect in Magnetically Doped Topological Josephson Junctions
• Implementation of single-qubit gates via parametric modulation in the Majorana transmon
• Growth of bilayer stanene on a magnetic topological insulator aided by a buffer layer
• 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
• Non-Abelian Evolution of a Majorana Train in a Single Josephson Junction
• Josephson junction arrays as a platform for topological phases of matter
• 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