Quantized critical supercurrent in SrTiO 3 -based quantum point contacts

Superconductivity in SrTiO 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 . Ionic liquid gating ac...

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Published inScience advances Vol. 7; no. 40; p. eabi6520
Main Authors Mikheev, Evgeny, Rosen, Ilan T, Goldhaber-Gordon, David
Format Journal Article
LanguageEnglish
Published United States 01.10.2021
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Abstract Superconductivity in SrTiO 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 . 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 as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.
AbstractList Superconductivity in SrTiO 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 . 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 as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.
A superconducting quantum constriction is realized by locally screening ionic liquid gating in SrTiO 3 . 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 toward establishing SrTiO 3 as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.
Author Goldhaber-Gordon, David
Mikheev, Evgeny
Rosen, Ilan T
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/34597141$$D View this record in MEDLINE/PubMed
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– ident: e_1_3_2_6_2
  doi: 10.1103/PhysRevB.71.174502
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Snippet Superconductivity in SrTiO occurs at remarkably low carrier densities and therefore, unlike conventional superconductors, can be controlled by electrostatic...
A superconducting quantum constriction is realized by locally screening ionic liquid gating in SrTiO 3 . Superconductivity in SrTiO 3 occurs at remarkably low...
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Title Quantized critical supercurrent in SrTiO 3 -based quantum point contacts
URI https://www.ncbi.nlm.nih.gov/pubmed/34597141
Volume 7
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