Does the Two-Dimensional t-J Model have Hole Pockets?

TL;DR

This study uses high temperature series expansion to analyze the 2D t-J model's momentum distribution function, finding no evidence of hole pockets at specific parameters, thus informing the understanding of its electronic structure.

Contribution

It provides the first high temperature series analysis of the momentum distribution in the 2D t-J model to explore the existence of hole pockets.

Findings

No indication of hole pockets at n=0.9 for J/t=0.5 or 1.0

High temperature series extrapolated to T=0.2J

Method offers a new approach to study electronic features in the t-J model

Abstract

We have calculated the high temperature series for the momentum distribution function n_k of the 2D t-J model to 12th order in inverse temperature. By extrapolating the series to T=0.2J we investigate the possibility of hole pockets in the t-J model. We find no indication of hole pockets at an electron density of n=0.9 with J/t=0.5 or J/t=1.0.