TY - JOUR
T1 - Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices
AU - van Driel, David
AU - Wang, Guanzhong
AU - Bordin, Alberto
AU - van Loo, Nick
AU - Zatelli, Francesco
AU - Mazur, Grzegorz P.
AU - Xu, Di
AU - Gazibegovic, Sasa
AU - Badawy, Ghada
AU - Bakkers, Erik P.A.M.
AU - Kouwenhoven, Leo P.
AU - Dvir, Tom
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85175183417&partnerID=8YFLogxK
U2 - 10.1038/s41467-023-42026-7
DO - 10.1038/s41467-023-42026-7
M3 - Article
C2 - 37898657
AN - SCOPUS:85175183417
SN - 2041-1723
VL - 14
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 6880
ER -