Quantized critical supercurrent in SrTiO3-based quantum point contacts

Mikheev, Evgeny; Rosen, Ilan T.; Goldhaber-Gordon, David

doi:10.1126/sciadv.abi6520

Quantized critical supercurrent in SrTiO₃-based quantum point contacts

Journal Article · Fri Oct 01 00:00:00 EDT 2021 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abi6520· OSTI ID:1813036

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Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Superconductivity in SrTiO₃ 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, SrTiO₃. 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 SrTiO₃ as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation (GBMF); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1813036

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 40 Vol. 7; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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