Detection of interaction-induced nonlocal effects using perfectly transmitting nanostructures

TL;DR

This paper investigates how nonlocal interaction effects influence conductance in one-dimensional nanostructures with perfect transmission, revealing that interactions can reduce overall conductance and enabling probing of interaction effects via noninteracting leads.

Contribution

It demonstrates that nonlocal effects cause conductance reduction in perfectly transmitting nanostructures, providing a method to probe interaction-induced dressing clouds.

Findings

Nonlocal interaction effects lower total conductance by over 50%.

Conductance correction depends on interaction strength and scatterer reflection.

Scaling laws for conductance effects are derived and experimental setups suggested.

Abstract

We consider one-dimensional transport through an interacting region in series with a point-like one-body scatterer. When the conductance of the interacting region is perfect, independently of the interaction strength, a nonlocal interaction effect yields a total conductance of the composed system that depends on the interaction strength and is lower than the transmission of the one-body scatterer. This qualitative nonlocal effect allows to probe the dressing cloud of an interacting system by ideal noninteracting leads. The conductance correction increases with the strength of the interaction and the reflection of the one-body scatterer (attaining relative changes >50%), and decreases with the distance between the interacting region and the one-body scatterer. Scaling laws are obtained and possible experimental realizations are suggested.