Correlation induced resonances in transport through coupled quantum dots

TL;DR

This paper studies how local electron correlations influence transport in parallel quantum dots, revealing novel correlation-induced resonances that depend exponentially on interaction strength and are robust against small detuning.

Contribution

It uncovers a new type of correlation-induced resonance in quantum dot transport, demonstrating its robustness and potential observability in experiments.

Findings

Discovery of a pair of correlation-induced resonances separated by an exponential energy scale.

Resonances are robust against small detuning of dot energy levels.

Effect occurs for arbitrary tunnel couplings, indicating broad applicability.

Abstract

We investigate the effect of local electron correlations on transport through parallel quantum dots. The linear conductance as a function of gate voltage is strongly affected by the interplay of the interaction U and quantum interference. We find a pair of novel correlation induced resonances separated by an energy scale that depends exponentially on U. The effect is robust against a small detuning of the dot energy levels and occurs for arbitrary generic tunnel couplings. It should be observable in experiments on the basis of presently existing double-dot setups.