Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Ivantsov, Ilya A."'
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 Gutzwiller projected operators, the most familiar examples are the t-J
Externí odkaz:
http://arxiv.org/abs/2110.04919
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, however: the relevant perturbation terms give rise to either short-range
Externí odkaz:
http://arxiv.org/abs/2010.12255
Publikováno v:
Phys. Rev. B 101, 195107 (2020)
Performing an exact diagonalization of the effective spin problem, a ferromagnetic ground state of kinetic origin is shown to emerge in a system of $N$ strongly correlated electrons on a $L$-site ring ($L > N$). This phenomenon is brought about by th
Externí odkaz:
http://arxiv.org/abs/1912.01535
Publikováno v:
Phys. Rev. B 98, 214511 (2018)
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 underdoped phase above the superconducting temperature $T_c$. It is shown t
Externí odkaz:
http://arxiv.org/abs/1808.02370
Publikováno v:
In Annals of Physics June 2022 441
Publikováno v:
Phys. Rev. B 96, 195161 (2017)
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 conventional Fermi liquid theory in the PG phase. A few phenomenologi
Externí odkaz:
http://arxiv.org/abs/1706.04011
Publikováno v:
Phys. Rev. B 95, 155115 (2017)
The Nagaoka ($U=\infty$) limit of the Hubbard model on a square lattice is mapped onto the itinerant-localized Kondo model at infinitely strong coupling. Such a model is well suited to perform quantum Monte Carlo (QMC) simulations to compute spin cor
Externí odkaz:
http://arxiv.org/abs/1612.03646
Publikováno v:
Phys. Rev. B 94, 235118 (2016)
We perform quantum Monte Carlo simulations of the itinerant-localized periodic Kondo-Heisenberg model for the underdoped cuprates to calculate the associated spin correlation functions. The strong electron correlations are shown to play a key role in
Externí odkaz:
http://arxiv.org/abs/1608.02298
Publikováno v:
IEEE Electromagnetic Compatibility Magazine; 2024, Vol. 13 Issue: 1 p51-60, 10p
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