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

O'Farrell, E. C.T.; Drachmann, A. C.C.; Hell, M. LU ; Fornieri, A.; Whiticar, A. M.; Hansen, E. B.; Gronin, S.; Gardner, G. C.; Thomas, C. LU and Manfra, M. J., et al. (2018) In Physical Review Letters 121(25).
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.

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publication status
published
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Physical Review Letters
volume
121
issue
25
publisher
American Physical Society
external identifiers
  • scopus:85059126517
ISSN
0031-9007
DOI
10.1103/PhysRevLett.121.256803
language
English
LU publication?
yes
id
cb469bf9-36f1-41c5-8d41-9ac96cd1c11d
date added to LUP
2019-01-11 13:56:56
date last changed
2019-02-20 11:42:41
@article{cb469bf9-36f1-41c5-8d41-9ac96cd1c11d,
  abstract     = {<p>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.</p>},
  articleno    = {256803},
  author       = {O'Farrell, E. C.T. and Drachmann, A. C.C. and Hell, M. and Fornieri, A. and Whiticar, A. M. and Hansen, E. B. and Gronin, S. and Gardner, G. C. and Thomas, C. and Manfra, M. J. and Flensberg, K. and Marcus, C. M. and Nichele, F.},
  issn         = {0031-9007},
  language     = {eng},
  month        = {12},
  number       = {25},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.121.256803},
  volume       = {121},
  year         = {2018},
}