48 citations · 343 across the 48 of their papers we have counts for
40 papers · 1 filter
Topological Hall effect induced by classical large-spin background: path-integral approach
Kaushal K. Kesharpu, Evgenii A. Kochetov, Alvaro Ferraz
The coherent-state path-integral technique is employed to study lattice electrons strongly coupled to a quantum spin background. In the large-spin limit it is replaced with…
Strong Correlation, Bloch Bundle Topology and Spinless Haldane-Hubbard Model
Ilya Ivantsov, Alvaro Ferraz, Evgenii Kochetov
Different realizations of the Hubbard operators in different Hilbert spaces give rise to various microscopic lattice electron models driven by strong correlations. In terms of the…
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…
Onset of ferromagnetism for strongly correlated electrons in one-dimensional chains
Hernan B Xavier, Evgenii Kochetov, Alvaro Ferraz
The existence of the Nagaoka ferromagnetism is examined in the context of the one-dimensional Hubbard model. We construct the exact quantum partition function to describ…
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…