Quantized critical supercurrent in SrTiO<sub>3</sub>-based quantum point contacts.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34597141.
- Also identified by DOI 10.1126/sciadv.abi6520 and PMC identifier 10938545.
- Licence recorded as CC BY-NC.
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Abstract
Superconductivity in SrTiO<sub>3</sub> 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<sub>3</sub>. 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 toward establishing SrTiO<sub>3</sub> as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.