Fermi liquid theory of resonant spin pumping

TL;DR

This paper develops a Fermi liquid theory combined with NRG to analyze resonant all-electric adiabatic spin pumping in a strongly interacting quantum dot, revealing spin resonance phenomena and conditions for pure spin transfer.

Contribution

It introduces a novel theoretical framework combining Fermi liquid theory and NRG to describe resonant spin pumping in quantum dots with strong interactions.

Findings

Resonant spin pumping occurs at each charging transition due to spin-orbit coupling.

A single pumping cycle can transfer a spin of approximately ħ/2.

Pure spin pumping can be achieved depending on device geometry.

Abstract

We study resonant all-electric adiabatic spin pumping through a quantum dot with two nearby levels by using a Fermi liquid approach in the strongly interacting regime, combined with a projective numerical renormalization group (NRG) theory. Due to spin-orbit coupling, a strong spin pumping resonance emerges at every charging transition, which allows for the transfer of a spin $~ \hbar/2$ through the device in a single pumping cycle. Depending on the precise geometry of the device, controlled pure spin pumping is also possible.