Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts

Abstract

Superconductivity in SrTiO${}_3$ occurs at remarkably low carrier densities and therefore, unlike conventional superconductors, can be controlled by electrostatic gates. Here we demonstrate nanoscale weak links connecting superconducting leads, all within a single material, SrTiO${}_3$. Ionic liquid gating accumulates carriers in the leads, and local electrostatic gates are tuned to open the weak link. These devices behave as superconducting quantum point contacts with a quantized critical supercurrent. This is a milestone towards establishing SrTiO${}_3$ as a single-material platform for mesoscopic superconducting transport experiments, that also intrinsically contains the necessary ingredients to engineer topological superconductivity

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Cited by in corpus (7)

• Selective Control of Conductance Modes in Multi-terminal Josephson Junctions
• Electrostatic field-driven supercurrent suppression in ionic-gated metallic Josephson nanotransistors
• Analytic approach to transport in superconducting junctions with arbitrary carrier density
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Ionic liquid gating of SrTiO${}_3$ lamellas fabricated with a focused ion beam
• Gate-defined superconducting channel in magic-angle twisted bilayer graphene
• BinPo: An open-source code to compute the band structure of two-dimensional electron systems