Superconductivity and Parity Preservation in As-Grown in Islands on InAs Nanowires

Martin Saurbrey Bjergfelt, Damon J. Carrad, Thomas Kanne, Erik Johnson, Elisabetta M. Fiordaliso, Thomas Sand Jespersen, Jesper Nygård*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

4 Downloads (Pure)

Abstract

We report in situ synthesis of crystalline indium islands on InAs nanowires grown by molecular beam epitaxy. Structural analysis by transmission electron microscopy showed that In crystals grew in a tetragonal body-centered crystal structure within two families of orientations relative to wurtzite InAs. The crystalline islands had lengths < 500 nm and low-energy surfaces, suggesting that growth was driven mainly by surface energy minimization. Electrical transport through In/InAs devices exhibited Cooper pair charging, evidencing charge parity preservation and a pristine In/InAs interface, with an induced superconducting gap ∼0.45 meV. Cooper pair charging persisted to temperatures > 1.2 K and magnetic fields ∼0.7 T, demonstrating that In/InAs hybrids belong to an expanding class of semiconductor/superconductor hybrids operating over a wider parameter space than state-of-the-art Al-based hybrids. Engineering crystal morphology while isolating single islands using shadow epitaxy provides an interesting alternative to previous semiconductor/superconductor hybrid morphologies and device geometries.
Original languageEnglish
JournalNano Letters
Volume21
Issue number23
Pages (from-to)9875-9881
ISSN1530-6984
DOIs
Publication statusPublished - 2021

Keywords

  • Hybrid nanowires
  • Indium
  • Nanoscale superconductors
  • Nanowires
  • Quantum materials

Fingerprint

Dive into the research topics of 'Superconductivity and Parity Preservation in As-Grown in Islands on InAs Nanowires'. Together they form a unique fingerprint.

Cite this