The SU(2) Gauge Theory of the Substantially Doped Mott-Insulator: the phase separated d+s superconductor

TL;DR

This paper reformulates the SU(2) gauge mean-field theory for doped Mott-insulators, accurately describing phase separation and predicting a d+s superconducting order parameter that aligns with experimental observations in cuprates.

Contribution

It extends the SU(2) gauge theory to high doping regimes and predicts a mixed d+s superconducting state consistent with experiments.

Findings

Accurately describes phase separation tendencies.

Predicts a d+s superconducting order parameter.

Aligns with Raman and tunneling measurements.

Abstract

We reformulate the mean-field theory associated with the SU(2) gauge theory of spin-charge separation in doped Mott-insulators of Wen and Lee so that it can deal with the regime of substantial carrier density. We find that it describes remarkably accurately phase separation tendencies. Moreover, for elegant reasons the theory insists that the superconducting state should have a d+s orderparameter with an s-wave component growing in the overdoped regime. This appears to be consistent with both Raman- and tunneling measurements in cuprate superconductors.