Momentum space anisotropy in doped Mott insulators

TL;DR

This paper investigates the momentum space anisotropy in doped Mott insulators using numerical analysis of the tt't''J-model, proposing a two-band model to explain the disparity between nodal and antinodal regions observed in experiments.

Contribution

It introduces a simple two-band model to understand how doped holes are screened by the spin background, explaining experimental anisotropy in cuprate superconductors.

Findings

Disparity between nodal and antinodal regions explained by local energetic considerations.

Differentiation between quasiparticle behavior and spin-charge separation.

Proposed model aligns with experimental observations in underdoped cuprates.

Abstract

We study the single hole tt't''J-model numerically to address the momentum space anisotropy found in doped Mott insulators. A simple two band picture to understand how the doped hole is screened by the spin background in states of different momenta is proposed. In this picture, the disparity between the nodal and antinodal regions, observed by experiments in the underdoped cuprate superconductors, follows from local energetic considerations and amounts to the distinction between well defined quasiparticle behavior and spin-charge separation related phenomenology.