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Hubbard model vs. Kondo model: Strong coupling limit
Ilya Ivantsov, Alvaro Ferraz, Evgenii Kochetov
The Hubbard model and the lattice Kondo model are shown to become identical in the strong-coupling limit. A departure from the strong-coupling regime produces distinct theories, ho…
Stable and Metastable Kinetic Ferromagnetism on a Ring
Ilya Ivantsov, Hernan B. Xavier, Alvaro Ferraz +1
Performing an exact diagonalization of the effective spin problem, a ferromagnetic ground state of kinetic origin is shown to emerge in a system of strongly correlated electron…
Fermi Surface Reconstruction in Underdoped Cuprates: The Origin of Electron Pockets
Ilya Ivantsov, Alvaro Ferraz, Evgenii Kochetov
A new phenomenological model is proposed to describe the evolution of the Fermi surface (FS) in a wide range of dopings. It reproduces the key features of the cuprates in the under…
Itinerant-localized model of strongly correlated electrons: Fermi-surface reconstruction
Ilya Ivantsov, Alvaro Ferraz, Evgenii Kochetov
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…