Transport through capacitively coupled embedded and T-shape quantum dots in the Kondo range

TL;DR

This paper investigates many-body electron correlation effects, including Kondo phenomena, in capacitively coupled quantum dot systems with embedded and T-shaped configurations, using a finite-U slave boson approach.

Contribution

It introduces a detailed analysis of SU(4), SU(3), and SU(2) Kondo resonances in coupled quantum dots, highlighting the effects of symmetry breaking.

Findings

Identification of SU(4) Kondo and Kondo-Fano resonances in linear response.

Observation of symmetry breaking leading to SU(3) and SU(2) resonances.

Properties of many-body resonances resemble those in double dot systems.

Abstract

Strong electron correlations and interference effects are discussed in capacitively coupled side attached and embedded quantum dots. The finite - U mean field slave boson approach is used to study many-body effects. In the linear range the many-body resonances exhibit SU(4) Kondo or Kondo-Fano like character and their properties in the corresponding arms are close to the properties of embedded or T- shape double dot systems respectively. Breaking of the spin symmetry in one of the arms or in both allows for the formation of many-body resonances of SU(3) or SU(2) symmetries in the linear range.