Chiral superconductivity in cuprates mediated by spin-orbit coupling to spinon superfluidity

TL;DR

This paper proposes a novel mechanism for chiral superconductivity in cuprates, where spin-orbit coupling between charge current and spinon superfluidity stabilizes the superconducting state, supported by theoretical modeling and experimental suggestions.

Contribution

It introduces a new theoretical framework linking spin-orbit coupling and spin liquid states to explain chiral superconductivity in cuprates.

Findings

Doping stabilizes a spin liquid state in cuprates.

Superconductivity arises from spin-orbit coupling to spinon superfluidity.

Experimental tests are proposed for the mechanism.

Abstract

We utilize the Hubbard model to demonstrate that doping of the antiferromagnetic parent compounds of cuprate superconductors stabilizes a spin liquid state. Superconductivity in such a state emerges due to the spin-orbit coupling between charge current and superfluidity of spinon condensate, resulting in a chiral relation between the order parameter phase gradient and supercurrent. We propose simple experimental tests for the presented mechanism.