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

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

Research output: Contribution to journalArticlepeer-review

18 Citations (SciVal)

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.

Original languageEnglish
Article number256803
JournalPhysical Review Letters
Volume121
Issue number25
DOIs
Publication statusPublished - 2018 Dec 19

Subject classification (UKÄ)

  • Condensed Matter Physics

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