English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate Kondo correlations in a quantum dot with normal andsuperconducting electrodes, where a spin bias voltage is applied across thedevice and the local interaction $U$ is either attractive or repulsive. Whenthe spin current is blockaded in the large-gap regime, this nonequilibriumstrongly-correlated problem maps into an equilibrium model solvable by thenumerical renormalization group method. The Kondo spectra with characteristicsplitting due to the nonequilibrium spin accumulation are thus obtained at highprecision. It is shown that while the bias-induced decoherence of the spinKondo effect is partially compensated by the superconductivity, the chargeKondo effect is enhanced out of equilibrium and undergoes an additionalsplitting by the superconducting proximity effect, yielding four Kondo peaks inthe local spectral density. In the charge Kondo regime, we find a universalscaling of charge conductance in this hybrid device under different spinbiases. The universal conductance as a function of the coupling to thesuperconducting lead is peaked at and hence directly measures the Kondotemperature. Our results are of direct relevance to recent experimentsrealizing negative-$U$ charge Kondo effect in hybrid oxide quantum dots [Nat.Commun. \textbf{8}, 395 (2017)].

Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias