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
- Publication:
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arXiv e-prints
- Pub Date:
- September 2020
- DOI:
- 10.48550/arXiv.2010.00183
- arXiv:
- arXiv:2010.00183
- Bibcode:
- 2020arXiv201000183M
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- doi:10.1126/sciadv.abi6520