Ferromagnetic proximity effect in F-QDot-S device
L. Hofstetter, S. Csonka, A. Geresdi, M. Aagesen, J. Nygard, C., Schonenberger
TL;DR
This paper investigates how a ferromagnetic lead influences an InAs nanowire quantum dot coupled to a superconductor, revealing a local exchange field and a novel mini-gap feature that depend on charge states.
Contribution
It demonstrates the ferromagnetic proximity effect in a quantum dot system, showing how the F lead induces a charge-dependent exchange field and a mini-gap related to F and S correlations.
Findings
F lead induces a charge-dependent exchange field on the QD.
A novel mini-gap feature visualizes the exchange field in even charge states.
The interplay of F and S correlations creates unique spectroscopic signatures.
Abstract
Ferromagnetic proximity effect is studied in InAs nanowire (NW) based quantum dots (QD) strongly coupled to a ferromagnetic (F) and a superconducting (S) lead. The influence of the F lead is detected through the splitting of the spin-1/2 Kondo resonance. We show that the F lead induces a local exchange field on the QD, which has varying amplitude and a sign depending on the charge states. The interplay of the F and S correlations generates an exchange field related supgap feature. This novel mini-gap allows now the visualization of the exchange field also in even charge states
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