Conductance through strongly interacting rings in a magnetic field

TL;DR

This paper investigates how strong electron interactions and magnetic flux influence conductance in quantum ring systems, revealing characteristic dips due to spin-charge separation that are observable at zero temperature.

Contribution

It introduces a model for conductance in interacting quantum rings with magnetic flux, highlighting the impact of spin-charge separation on conductance features.

Findings

Pronounced conductance dips at specific magnetic flux values.

Spin-charge separation causes distinct conductance features.

Dips are observable at zero temperature.

Abstract

We study the conductance through finite Aharonov-Bohm rings of interacting electrons weakly coupled to non-interacting leads at two arbitrary sites. This model can describe an array of quantum dots with a large charging energy compared to the interdot overlap. As a consequence of the spin-charge separation, which occurs in these highly correlated systems, the transmittance is shown to present pronounced dips for particular values of the magnetic flux piercing the ring. We analyze this effect by numerical and analytical means and show that the zero-temperature equilibrium conductance in fact presents these striking features which could be observed experimentally.