Fermi surface and pseudogap in electron-doped cuprates

TL;DR

This study numerically investigates the evolution of the Fermi surface and pseudogap in electron-doped cuprates using the t-t'-J model, revealing doping-dependent changes and temperature effects consistent with experimental observations.

Contribution

It provides a detailed numerical analysis of spectral functions, Fermi surface evolution, and pseudogap behavior in electron-doped cuprates within the t-t'-J model, without assuming Mott gap closure.

Findings

Fermi surface transitions from pocket-like to large with doping

Pseudogap is prominent at low doping and disappears at intermediate doping

Temperature strongly influences pseudogap and magnetic correlations

Abstract

Spectral functions are evaluated numerically within the t-t'-J model as relevant for electron-doped cuprates. The Fermi surface develops from a pocket-like into a large one with doping. The corresponding pseudogap in the nodal direction is well resolved at low doping and vanishes at intermediate doping. Its presence is strongly temperature dependent and thus connected to longer-range antiferromagnetic correlations. Features including double effective band and optical conductivity are consistent with experiments on electron-doped cuprates without invoking the closing of the Mott-Hubbard gap.