Kondo effects in a triangular triple quantum dot with lower symmetries

TL;DR

This paper investigates the diverse Kondo effects in a triangular triple quantum dot system with broken symmetries, analyzing how electron filling and distortions influence low-temperature properties and Kondo energy scales.

Contribution

It provides a comprehensive theoretical analysis of Kondo phenomena in asymmetric triangular quantum dots using numerical renormalization group methods.

Findings

Identification of different Kondo regimes depending on electron filling and distortions

Analysis of the impact of symmetry breaking on Kondo effects

Mapping of the parameter space for various Kondo behaviors

Abstract

The triangular triple quantum dot is an interesting system which can demonstrate various types of the Kondo effects, such as the one due to the local spin S=1 moment caused by the Nagaoka ferromagnetic mechanism and the SU(4) Kondo effect. We theoretically study the low-temperature properties and the Kondo energy scale of the triangular triple quantum dot, using the Wilson numerical renormalization group. We have explored a wide parameter region of the electron-filling and distortions which break the symmetry of an equilateral structure. Our results give a comprehensive overview of how the Kondo behavior varies in the different the regions in the wide parameter space of the triangular triple quantum dot.