# Itinerant-localized model of strongly correlated electrons: Fermi-surface reconstruction

## TL;DR

This paper demonstrates that the Fermi-surface reconstruction observed in underdoped cuprates can be explained microscopically using the standard $t-J$ model, emphasizing the importance of strong electron correlations.

## Contribution

It provides a microscopic derivation of Fermi-surface reconstruction in cuprates within the $t-J$ model, aligning theory with experimental observations.

## Key findings

- Fermi surface transforms into small pockets in underdoped cuprates.
- Strong electron correlations are essential for accurate modeling.
- The $t-J$ model explains the breakdown of Fermi liquid behavior.

## Abstract

A number of recent experiments have highlighted a remarkable transformation of a large cuprate Fermi surface into small pockets in the underdoped region signalling a breakdown of a conventional Fermi liquid theory in the PG phase. A few phenomenological models have been recently put forward to account for this transformation. However, none of those models have been derived microscopically nor are totally compatible with experimental data. In the present work we show that the observed Fermi-surface reconstruction can be accounted for directly within a standard microscopic $t-J$ model of correlated electrons, provided strong electron correlations are properly taken into account.