Kondo effect and spin filtering in coupled quantum dots

TL;DR

This paper investigates the Kondo effect and spin filtering in coupled quantum dots, analyzing how interactions and magnetic fields influence electron transport and spin polarization using theoretical methods.

Contribution

It introduces a comprehensive analysis of spin and charge correlations in quantum dots with SU(2N) symmetry and explores conditions for spin filtering under magnetic fields.

Findings

Spin and charge correlations are entangled in the SU(2N) symmetric regime.

Magnetic fields can break degeneracy but may be tuned to restore it for spin filtering.

Theoretical methods reveal conditions for spin filtering in coupled quantum dots.

Abstract

The coherent transport through a set of N quantum dots coupled in parallel is considered in the limit of infinite intradot and finite or infinite interdot interactions. The mean field slave boson approach and the equation of motion method are used. For the full spin-orbit degenerate case the low energy behavior is characterized by an SU(2N) symmetry with entangled spin and charge correlations. The magnetic field breaks the spin degeneracy, but for the special choices of gate voltages the degeneracy might be recovered in one spin channel allowing the spin filtering.