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

doi:10.1103/PhysRevLett.121.256803

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 journal › Article › peer-review

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 language	English
Article number	256803
Journal	Physical Review Letters
Volume	121
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.121.256803
Publication status	Published - 2018 Dec 19

Subject classification (UKÄ)

Condensed Matter Physics

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10.1103/PhysRevLett.121.256803

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O'Farrell, E. C. T., Drachmann, A. C. C., Hell, M., Fornieri, A., Whiticar, A. M., Hansen, E. B., Gronin, S., Gardner, G. C., Thomas, C., Manfra, M. J., Flensberg, K., Marcus, C. M., & Nichele, F. (2018). Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands. Physical Review Letters, 121(25), Article 256803. https://doi.org/10.1103/PhysRevLett.121.256803

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title = "Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands",

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.",

author = "O'Farrell, {E. C.T.} and Drachmann, {A. C.C.} and M. Hell and A. Fornieri and Whiticar, {A. M.} and Hansen, {E. B.} and S. Gronin and Gardner, {G. C.} and C. Thomas and Manfra, {M. J.} and K. Flensberg and Marcus, {C. M.} and F. Nichele",

year = "2018",

month = dec,

day = "19",

doi = "10.1103/PhysRevLett.121.256803",

language = "English",

volume = "121",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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T1 - Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands

AU - O'Farrell, E. C.T.

AU - Drachmann, A. C.C.

AU - Hell, M.

AU - Fornieri, A.

AU - Whiticar, A. M.

AU - Hansen, E. B.

AU - Gronin, S.

AU - Gardner, G. C.

AU - Thomas, C.

AU - Manfra, M. J.

AU - Flensberg, K.

AU - Marcus, C. M.

AU - Nichele, F.

PY - 2018/12/19

Y1 - 2018/12/19

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.121.256803

DO - 10.1103/PhysRevLett.121.256803

M3 - Article

C2 - 30608825

AN - SCOPUS:85059126517

SN - 0031-9007

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

M1 - 256803

ER -

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

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