Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic-insulator islands

S. Vaitiekėnas; R. Seoane Souto; Y. Liu; P. Krogstrup; K. Flensberg; M. Leijnse; C. M. Marcus

doi:10.1103/PhysRevB.105.L041304

Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic-insulator islands

S. Vaitiekėnas, R. Seoane Souto, Y. Liu, P. Krogstrup, K. Flensberg, M. Leijnse, C. M. Marcus

Condensed Matter Physics

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

We report Coulomb blockade transport studies of semiconducting InAs nanowires grown with epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping facets. Comparing experiment to a theoretical model, we associate cotunneling features in even-odd bias spectra with spin-polarized Andreev levels. Results are consistent with zero-field spin splitting exceeding the induced superconducting gap. Energies of subgap states are tunable on either side of zero via electrostatic gates.

Original language	English
Article number	L041304
Journal	Physical Review B
Volume	105
Issue number	4
Number of pages	5
ISSN	2469-9950
DOIs	https://doi.org/10.1103/PhysRevB.105.L041304
Publication status	Published - 31 Jan 2022

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Publisher Copyright:
© 2022 American Physical Society.

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10.1103/PhysRevB.105.L041304

PhysRevB.105.L041304Final published version, 981 KB

https://arxiv.org/pdf/2104.01463.pdf

Cite this

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title = "Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic-insulator islands",

abstract = "We report Coulomb blockade transport studies of semiconducting InAs nanowires grown with epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping facets. Comparing experiment to a theoretical model, we associate cotunneling features in even-odd bias spectra with spin-polarized Andreev levels. Results are consistent with zero-field spin splitting exceeding the induced superconducting gap. Energies of subgap states are tunable on either side of zero via electrostatic gates.",

author = "S. Vaitiekėnas and Souto, {R. Seoane} and Y. Liu and P. Krogstrup and K. Flensberg and M. Leijnse and Marcus, {C. M.}",

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AU - Vaitiekėnas, S.

AU - Souto, R. Seoane

AU - Liu, Y.

AU - Krogstrup, P.

AU - Flensberg, K.

AU - Leijnse, M.

AU - Marcus, C. M.

PY - 2022/1/31

Y1 - 2022/1/31

N2 - We report Coulomb blockade transport studies of semiconducting InAs nanowires grown with epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping facets. Comparing experiment to a theoretical model, we associate cotunneling features in even-odd bias spectra with spin-polarized Andreev levels. Results are consistent with zero-field spin splitting exceeding the induced superconducting gap. Energies of subgap states are tunable on either side of zero via electrostatic gates.

AB - We report Coulomb blockade transport studies of semiconducting InAs nanowires grown with epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping facets. Comparing experiment to a theoretical model, we associate cotunneling features in even-odd bias spectra with spin-polarized Andreev levels. Results are consistent with zero-field spin splitting exceeding the induced superconducting gap. Energies of subgap states are tunable on either side of zero via electrostatic gates.

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DO - 10.1103/PhysRevB.105.L041304

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