Engineering the Kondo and Fano effects in double quantum dots

TL;DR

This paper explores how the Kondo and Fano effects can be precisely controlled in a double quantum dot system, revealing complex phenomena like triple Kondo splitting and tunable interference effects.

Contribution

It introduces a method to manipulate the Kondo and Fano effects in a double quantum dot setup, demonstrating novel interference phenomena and tunable quantum states.

Findings

Observation of triple Kondo splitting due to interference effects

Demonstration of tunable Fano-Kondo phenomena in the device

Ability to switch between coupled and decoupled dot regimes

Abstract

We demonstrate delicate control over the Kondo effect and its interplay with quantum interference in an Aharonov-Bohm interferometer containing one Kondo dot and one noninteracting dot. It is shown that the Kondo resonance undergoes a dramatic evolution as the interdot tunnel coupling progressively increases. A novel triple Kondo splitting occurs from the interference between constant and Lorentzian conduction bands that cooperate in forming the Kondo singlet. The device also manifests a highly controllable Fano-Kondo effect in coherent electronic transport, and can be tuned to a regime where the coupled dots behave as decoupled dots.