arxiv: 1804.09676 · v1 · pith:RTJ6GMEDnew · submitted 2018-04-25 · ❄️ cond-mat.mes-hall · cond-mat.supr-con

Hybridization of sub-gap 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. Gardener

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C. Thomas M. J. Manfra K. Flensberg C. M. Marcus F. Nichele

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classification ❄️ cond-mat.mes-hall cond-mat.supr-con

keywords coulombstatessub-gapfieldgateislandsmagneticone-dimensional

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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 sub-gap states, Coulomb blockade reveals Cooper-pair mediated transport. When sub-gap 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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Hybridization of sub-gap states in one-dimensional superconductor/semiconductor Coulomb islands

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