Multiple-gap structure in electric-field-induced surface superconductivity

Abstract

Local superconducting gap structure is studied as a function of nanoscale depth in electric-field-induced surface superconductivity such as in SrTiO3. We examine solutions of Bogoliubov-de Gennes equation in two limiting confinement potential cases of electric field with and without screening effects. As unique properties different from bulk superconductivity, there appear in-gap states even for isotropic s-wave pairing, due to multiple gap structure of sub-band dependent surface superconductivity. These determine the depth-dependence of local superconductivity.

5 pages, 4 figures

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Cited by in corpus (10)

• Band-edge BCS-BEC crossover in a two-band superconductor: physical properties and detection parameters
• Emergent phenomena in multicomponent superconductivity: an introduction to the focus issue
• Multi-Orbital Superconductivity in SrTiO3 /LaAlO3 Interface and SrTiO3 Surface
• A doping-dependent switch from one- to two-component superfluidity at temperature above 100K in coupled electron-hole Van der Waals heterostructures
• Surface superconductor-insulator transition induced by an electric field
• Non-gapless excitation and zero-bias fast oscillations in the LDOS of surface superconducting states
• Tunable Coupling of Two-Dimensional Superconductors in Bilayer SrTiO3 Heterostructures
• Tailoring of the interference-induced surface superconductivity by an applied electric field
• The Tomasch effect in nanoscale superconductors
• Pair-breaking of multi-gap superconductivity under parallel magnetic fields in electric-field-induced surface metallic state