Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands

Research output: Contribution to journalArticle

Abstract

We present measurements of one-dimensional superconductor-semiconductor Coulomb islands, fabricated by gate confinement of a two-dimensional InAs heterostructure with an epitaxial Al layer. When tuned via electrostatic side gates to regimes without subgap states, Coulomb blockade reveals Cooper-pair mediated transport. When subgap states are present, Coulomb peak positions and heights oscillate in a correlated way with magnetic field and gate voltage, as predicted theoretically, with (anti)crossings in (parallel) transverse magnetic field indicating Rashba-type spin-orbit coupling. Overall results are consistent with a picture of overlapping Majorana zero modes in finite wires.

Details

Authors
  • E. C.T. O'Farrell
  • A. C.C. Drachmann
  • M. Hell
  • A. Fornieri
  • A. M. Whiticar
  • E. B. Hansen
  • S. Gronin
  • G. C. Gardner
  • C. Thomas
  • M. J. Manfra
  • K. Flensberg
  • C. M. Marcus
  • F. Nichele
Organisations
External organisations
  • Purdue University
  • University of Copenhagen
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics
Original languageEnglish
Article number256803
JournalPhysical Review Letters
Volume121
Issue number25
StatePublished - 2018 Dec 19
Publication categoryResearch
Peer-reviewedYes