Orbital entanglement mechanism of superconductivity in cuprates

TL;DR

This paper proposes that orbital entanglement mediated by orbitally-selective charge hopping in a 1D Hubbard model explains superconductivity in cuprates and other unconventional superconductors, highlighting doping's role in suppressing correlations.

Contribution

It introduces a novel orbital entanglement mechanism for superconductivity in cuprates using a 1D Hubbard model, offering insights for discovering new high-temperature superconductors.

Findings

Orbital entanglement facilitates superconductivity in cuprates.

Doping suppresses Mott correlations and orbital ordering.

The mechanism applies to other unconventional superconductors.

Abstract

We utilize a 1d Hubbard model to show that the superconductivity in cuprate superconductors likely arises due to the orbital entanglement between holes in the copper oxide plane mediated by orbitally-selective charge hopping. The main role of doping required to achieve superconductivity in cuprates is to suppress the Mott correlations and orbital ordering. The proposed mechanism explains superconductivity in other unconventional superconductors, and provides guidance in the search for new high-temperature superconductors.