Proximity induced time-reversal topological superconductivity in Bi2Se3 films without phase tuning

Abstract

Many proposals to generate a time-reversal invariant topological superconducting phase are based on imposing a $\pi$ phase difference between the superconducting leads proximitizing a nanostructure. We show that this phase can be induced on a thin film of a topological insulator like Bi${}_2$Se${}_3$ in proximity to a single s-wave superconductor. In our analysis we take into account the parity degree of freedom of the electronic states which is not included in effective Dirac-like surface theories. We find that the topological phase can be reached when the induced interparity pairing dominates over the intraparity one. Application of an electric field perpendicular to the film extends the range of parameters where the topological phase occurs.

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• Intrinsic Time-reversal-invariant Topological Superconductivity in Thin Films of Iron-based Superconductors
• Majorana bound states in topological insulators without a vortex
• Surface Bogoliubov-Dirac cones and helical Majorana hinge modes in superconducting Dirac semimetals
• Survival of the fractional Josephson effect in time-reversal-invariant topological superconductors
• Josephson junctions of 2D time-reversal invariant superconductors: signatures of the topological phase
• Spin-orbit-coupled superconductivity with spin-singlet non-unitary pairing
• Exact analytical solution of a time-reversal-invariant topological superconducting wire
• Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure
• Intrinsic chiral topological superconductor thin films
• Binding zero modes with fluxons in Josephson junctions of time-reversal invariant topological superconductors
• Long-range Cooper pair splitting by chiral Majorana edge states