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- Title
Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices.
- Authors
van Driel, David; Wang, Guanzhong; Bordin, Alberto; van Loo, Nick; Zatelli, Francesco; Mazur, Grzegorz P.; Xu, Di; Gazibegovic, Sasa; Badawy, Ghada; Bakkers, Erik P. A. M.; Kouwenhoven, Leo P.; Dvir, Tom
- 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. Andreev bound states can form in hybrid semiconducting-superconducting devices and can mirror the experimental signatures of the much sought topologically non-trivial Majorana bound states. Here, van Driel, Wang and coauthors present a method of directly measuring the spin-polarized excitation spectrum of Andreev bound states.
- Subjects
NANOWIRE devices; SEMICONDUCTOR nanowires; NANOWIRES; EXCITATION spectrum; SPIN-orbit interactions; SPIN excitations; EXCITED states
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-42026-7