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Ballistic superconductivity and tunable pi-junctions in InSb quantum wells

Journal Article (2019)
Author(s)

Chung Ting Ke (Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab, TU Delft - QuTech Advanced Research Centre)

Christian M. Moehle (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)

Folkert K. de Vries (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)

Candis Thomas (Purdue University)

Sara Metti (Purdue University, Birck Nanotechnology Center)

Charles R. Guinn (Purdue University)

Mario Lodari (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab, Kavli institute of nanoscience Delft)

Giordano Scappucci (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab)

Srijit Goswami (Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab, TU Delft - QuTech Advanced Research Centre)

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Research Group
QRD/Goswami Lab
DOI related publication
https://doi.org/10.1038/s41467-019-11742-4 Final published version
More Info
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Publication Year
2019
Language
English
Research Group
QRD/Goswami Lab
Issue number
1
Volume number
10
Article number
3764
Downloads counter
363
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Institutional Repository
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Abstract

Planar Josephson junctions (JJs) made in semiconductor quantum wells with large spin-orbit coupling are capable of hosting topological superconductivity. Indium antimonide (InSb) two-dimensional electron gases (2DEGs) are particularly suited for this due to their large Landé g-factor and high carrier mobility, however superconducting hybrids in these 2DEGs remain unexplored. Here we create JJs in high quality InSb 2DEGs and provide evidence of ballistic superconductivity over micron-scale lengths. A Zeeman field produces distinct revivals of the supercurrent in the junction, associated with a 0−π transition. We show that these transitions can be controlled by device design, and tuned in-situ using gates. A comparison between experiments and the theory of ballistic π-Josephson junctions gives excellent quantitative agreement. Our results therefore establish InSb quantum wells as a promising new material platform to study the interplay between superconductivity, spin-orbit interaction and magnetism.