Quantum critical transition from charge-ordered to superconducting state in the triangular lattice negative-U extended Hubbard model

TL;DR

This paper investigates a transition from charge order to superconductivity driven by frustration in a specific Hubbard model, offering insights into unconventional superconductivity in organic materials.

Contribution

It introduces a robust frustration-driven transition in the negative-U extended Hubbard model, highlighting its relevance to understanding unconventional superconductivity.

Findings

Superconductivity spans a broad parameter space.

Charge-order to superconductivity transition is frustration-driven.

Model provides insights into organic charge-transfer solids.

Abstract

We demonstrate a robust frustration-driven charge-order to superconductivity transition in the half-filled negative-U extended Hubbard model. Superconductivity extends over a broad region of the parameter space. We argue that the model provides the correct insight to understanding unconventional superconductivity in the organic charge-transfer solids and other quarter-filled systems.