Fano Regime of Transport through Open Quantum Dots

TL;DR

This paper investigates the Fano regime in transport through open quantum dots, revealing various resonant states, hybrid modes, and phenomena like resonance trapping, indicating the dot's behavior akin to an artificial molecule.

Contribution

It introduces a detailed analysis of resonant states in strongly coupled quantum dots, highlighting the dominance of interacting resonances and the formation of hybrid modes.

Findings

Resonant states similar to isolated dot eigenstates with increasing widths

Hybrid resonant states formed as linear combinations of eigenstates

Observation of resonance trapping and level repulsion phenomena

Abstract

We analyze a quantum dot strongly coupled to the conducting leads via quantum point contacts - Fano regime of transport - and report a variety of resonant states which demonstrate the dominance of the interacting resonances in the scattering process in a low confining potential. There are resonant states similar to the eigenstates of the isolated dot, whose widths increase with increasing the coupling strength to the environment, and hybrid resonant states. The last ones are approximatively obtained as a linear combination of eigenstates with the same parity in the lateral direction, and the corresponding resonances show the phenomena of resonance trapping or level repulsion. The existence of the hybrid modes suggests that the open quantum dot behaves in the Fano regime like an artificial molecule.