Quantum magnetic oscillations and angle-resolved photoemission from impurity bands in cuprate superconductors

TL;DR

This paper reconciles ARPES and quantum oscillation data in cuprate superconductors by proposing an impurity band model within a charge-transfer Mott-Hubbard insulator, explaining the presence of small Fermi pockets.

Contribution

It introduces a novel impurity band framework that unifies ARPES and quantum oscillation observations in cuprates.

Findings

Impurity band model explains small Fermi pockets in cuprates.

Reconciles discrepancies between ARPES and quantum oscillation data.

Provides new insights into the electronic structure of cuprate superconductors.

Abstract

Present-day angle-resolved photoemission spectroscopy (ARPES) has offered a tremendous advance in the understanding of electron energy spectra in cuprate superconductors and some related compounds. However, in high magnetic field, magnetic quantum oscillations at low temperatures indicate the existence of small electron (hole) Fermi pockets seemingly missing in ARPES of hole (electron) doped cuprates. Here ARPES and quantum oscillations are reconciled in the framework of an impurity band in the charge-transfer Mott-Hubbard insulator.