Fermi-surface properties of the perovskite superconductors Claudius Gros
Roser Valenti
TL;DR
This paper models the Fermi-surface properties of cuprate superconductors using a three-band Hubbard model, aligning well with experimental data and exploring effects like doping and van-Hove singularities.
Contribution
It introduces a cluster expansion approach to calculate Fermi-surface properties, providing insights into doping effects and sum-rule violations in cuprates.
Findings
Fermi-surface topology matches ARPES data at ~20% doping
Quantitative agreement with experimental chemical potential shifts
Discussion of Luttinger sum-rule violations at low doping
Abstract
We calculate Fermi-surface properties of the Cuprate superconductors within the three-band Hubbard model using a cluster expansion for the proper self-energy. The Fermi-surface topology is in agreement with angular-resolved photoemission data for dopings . We discuss possible violations of the Luttinger sum-rule for smaller dopings and the role of van-Hove singularities in the density of states of the Zhang-Rice singlets. We calculate the shift in the chemical potential upon doping and find quantitative agreement with recent experiments.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides