Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices

David Driel, Guanzhong Wang, Alberto Bordin, Nick Loo, Francesco Zatelli, Grzegorz P. Mazur, Di Xu, Sasa Gazibegovic, Ghada Badawy, Erik P. A. M. Bakkers, Leo P. Kouwenhoven and Tom Dvir ()
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David Driel: Delft University of Technology
Guanzhong Wang: Delft University of Technology
Alberto Bordin: Delft University of Technology
Nick Loo: Delft University of Technology
Francesco Zatelli: Delft University of Technology
Grzegorz P. Mazur: Delft University of Technology
Di Xu: Delft University of Technology
Sasa Gazibegovic: Eindhoven University of Technology
Ghada Badawy: Eindhoven University of Technology
Erik P. A. M. Bakkers: Eindhoven University of Technology
Leo P. Kouwenhoven: Delft University of Technology
Tom Dvir: Delft University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Semiconductor nanowires coupled to superconductors can host Andreev bound states with distinct spin and parity, including a spin-zero state with an even number of electrons and a spin-1/2 state with odd-parity. Considering the difference in spin of the even and odd states, spin-filtered measurements can reveal the underlying ground state. To directly measure the spin of single-electron excitations, we probe an Andreev bound state using a spin-polarized quantum dot that acts as a bipolar spin filter, in combination with a non-polarized tunnel junction in a three-terminal circuit. We observe a spin-polarized excitation spectrum of the Andreev bound state, which can be fully spin-polarized, despite strong spin-orbit interaction in the InSb nanowires. Decoupling the hybrid from the normal lead causes a current blockade, by trapping the Andreev bound state in an excited state. Spin-polarized spectroscopy of hybrid nanowire devices, as demonstrated here, is proposed as an experimental tool to support the observation of topological superconductivity.

Date: 2023
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DOI: 10.1038/s41467-023-42026-7

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