Optimized wave function by kinetic renormalization effect in strongly correlated region of the three-band Hubbard model

We investigate the ground state of the two-dimensional single-band Hubbard model and three-band Hubbard model (d-p model) by using a variational Monte Carlo method. We employ an optimization variational Monte Carlo method. In this method the many-body wave function is improved and optimized by intro...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-07, Vol.1054 (1), p.12017
Main Authors: Yanagisawa, Takashi, Hase, Izumi, Miyazaki, Mitake, Yamaji, Kunihiko
Format: Article
Language:English
Subjects:
Antiferromagnetism
Correlation
Electrons
High temperature
Monte Carlo simulation
Optimization
Physics
Superconductivity
Two dimensional models
Wave functions
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Summary:We investigate the ground state of the two-dimensional single-band Hubbard model and three-band Hubbard model (d-p model) by using a variational Monte Carlo method. We employ an optimization variational Monte Carlo method. In this method the many-body wave function is improved and optimized by introducing variational parameters in the form: ψ = exp(-S)ψ0 where ψ0 is a wave function, for example, the Gutzwiller function, and S is an operator used to include the many-body effect. The strong magnetic correlation is induced by the on-site Coulomb repulsive interaction U. The magnetic correlation plays a significant role in correlated electron systems as an origin of electron pairing as well as a main competitor of superconductivity. High-temperature superconductivity occurs in the strongly correlated region where U is greater than the bandwidth. We investigate the stability of antiferromagnetic state in the three-band d-p model.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1054/1/012017