Competition between superconductivity and the pseudogap phase in the t-J model

TL;DR

This paper investigates the competition between superconductivity and the pseudogap phase in the t-J model, analyzing order parameters and collective excitations, and proposing Raman spectroscopy as a probe for charge density wave fluctuations.

Contribution

It provides a detailed analysis of the doping dependence of order parameters and introduces the use of Raman spectroscopy to probe amplitude fluctuations of the d-CDW in the t-J model.

Findings

Doping dependence of superconducting and d-CDW order parameters

Identification of Raman spectrum as a probe for d-CDW fluctuations

Insights into the interplay between superconductivity and pseudogap phases

Abstract

The t-J model in the large N limit (N denotes the number of spin components) yields a pseudogap phase in the underdoped region which is related to a d-wave charge density wave (d-CDW). We present results for the doping dependence of the superconducting and d-CDW order parameters as well as for collective excitations in the presence of these two order parameters. We argue that the electronic Raman spectrum with B$_{1g}$ symmetry probes the amplitude fluctuations of the d-CDW at zero momentum.