Superconductivity in the t-J model

TL;DR

This paper compares different microscopic theories of superconductivity in the strongly correlated two-dimensional t-J model, analyzing their approaches and the resulting pairing symmetries, and concludes that the slave-fermion method is inadequate for describing the pairing.

Contribution

It provides a comparative analysis of the projection technique and slave-fermion representation for the t-J model, highlighting limitations of the latter.

Findings

Projection technique supports s-wave pairing

Slave-fermion approach predicts p-wave pairing

Slave-fermion method found inadequate for accurate description

Abstract

A comparison of microscopic theories of superconductivity in the limit of strong electron correlations is presented. We consider results for the two-dimensional t-J model obtained within the projection technique for the Green functions in terms of the Hubbard operators and the slave-fermion representation for the RVB state. It is argued that the latter approach resulting in the odd-symmetry p-wave pairing for fermions is inadequate.