Transport through strongly correlated triple quantum dot

TL;DR

This paper investigates electron transport in a system of three strongly correlated quantum dots with various interaction regimes, revealing diverse charge and spin phenomena using a mean field slave boson approach.

Contribution

It introduces a comprehensive analysis of transport properties in triple quantum dots considering both attractive and repulsive interactions, highlighting new charge and spin Kondo effects.

Findings

Charge ordered states identified under certain interactions

Spin and charge Kondo resonances observed

Behavior varies with interaction ratio and sign

Abstract

Strong electron correlations are discussed for the three capacitively coupled quantum dots, each of which is connected to a separate pair of electrodes. The finite-$U$ mean field slave boson approach is used. The analysis is carried out for both repulsive and attractive intra- and inter-dot interactions. Depending on the ratio and the sign of interaction parameters and occupation, either charge ordered states or different spin, spin-charge and charge Kondo resonances arise.