Spin-charge separation in strongly interacting finite ladder rings

TL;DR

This paper investigates how strongly interacting electrons in finite ladder rings exhibit spin-charge separation, evidenced by conductance dips as a function of magnetic flux, suggesting observable signatures in nanoscopic devices.

Contribution

It demonstrates the presence of spin-charge separation signatures in ladder systems modeled by the t-J model, extending previous chain-based predictions to more complex geometries.

Findings

Conductance dips as a function of magnetic flux indicate spin-charge separation.

Characteristic features observed across a wide parameter range.

Potential for experimental observation in nanoscopic ladder systems.

Abstract

We study the conductance through Aharonov-Bohm finite ladder rings with strongly interacting electrons, modelled by the prototypical t-J model. For a wide range of parameters we observe characteristic dips in the conductance as a function of magnetic flux, predicted so far only in chains which are a signature of spin and charge separation. These results open the possibility of observing this peculiar many-body phenomenon in anisotropic ladder systems and in real nanoscopic devices.