Correlation-induced resonances and population switching in a quantum dot coulomb valley

TL;DR

This paper investigates how strong electron correlations in a spinless quantum dot lead to correlation-induced resonances and population switching, revealing asymmetric conductance peaks linked to pseudospin fluctuations.

Contribution

It introduces the concept of correlation-induced resonances in a quantum dot with degenerate levels and establishes an exact relation to population switching phenomena.

Findings

Asymmetric conductance peaks emerge near Coulomb valley center

Pseudospin fluctuations cause correlation-induced resonances

Exact relation between conductance features and population switching

Abstract

Strong correlation effects on electron transport through a spinless quantum dot are considered. When two single-particle levels in the quantum dot are degenerate, a conserved pseudospin degree of freedom appears for general tunneling matrix elements between the quantum dot and leads. Local fluctuations of the pseudospin in the quantum dot give rise to a pair of asymmetric conductance peaks near the center of a Coulomb valley. An exact relation to the population switching is provided.