Spin Transport in Ferromagnet-InSb Nanowire Quantum Devices

Zedong Yang, Brett Heischmidt, Sasa Gazibegovic, Ghada Badawy, Diana Car, Paul A. Crowell, Erik P.A.M. Bakkers, Vlad Pribiag

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Signatures of Majorana zero modes (MZMs) have been observed in semiconductor nanowires (NWs) with a strong spin-orbital interaction (SOI) with proximity-induced superconductivity. Realizing topological superconductivity and MZMs in this platform requires eliminating spin degeneracy by applying a magnetic field. However, the field can adversely impact the induced superconductivity and places geometric restrictions on the device. These challenges could be circumvented by integrating magnetic elements with the NWs. Here, we report the first experimental investigation of spin transport across InSb NWs with ferromagnetic (FM) contacts. We observe signatures of spin polarization and spin-dependent transport in the quasi-one-dimensional ballistic regime. Moreover, we show that electrostatic gating tunes the observed magnetic signal and reveals a regime where the device acts as a spin filter. These results open an avenue toward developing MZM devices with spin degeneracy lifted locally without external fields. They could also enable spin-based devices that leverage spin-orbital states in quantum wires.

Original languageEnglish (US)
Pages (from-to)3232-3239
Number of pages8
JournalNano letters
Volume20
Issue number5
DOIs
StatePublished - May 13 2020

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

Keywords

  • 1D ballistic spin transport
  • helical gap
  • InSb nanowire
  • semiconductor-ferromagnet quantum device

MRSEC Support

  • Shared

PubMed: MeSH publication types

  • Journal Article

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