Variational study of Fermi-surface deformations in Hubbard models
J\"org B\"unemann, Tobias Schickling, Florian Gebhard
TL;DR
This paper introduces a new diagrammatic method to analytically evaluate Gutzwiller wave functions, revealing correlation-induced Fermi surface deformations and Pomeranchuk instabilities in two-dimensional Hubbard models at high Coulomb interactions.
Contribution
It presents a novel analytical approach for studying Fermi surface deformations in Hubbard models, confirming Pomeranchuk instabilities with a new diagrammatic technique.
Findings
Identification of Pomeranchuk instabilities at large Coulomb interactions
Agreement with renormalization-group results
Analytical evaluation of Gutzwiller wave functions in finite dimensions
Abstract
We study the correlation-induced deformation of Fermi surfaces by means of a new diagrammatic method which allows for the analytical evaluation of Gutzwiller wave functions in finite dimensions. In agreement with renormalization-group results we find Pomeranchuk instabilities in two-dimensional Hubbard models for sufficiently large Coulomb interactions.
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