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Condens. Matter 2018, 3(3), 26; https://doi.org/10.3390/condmat3030026

Crossover Induced Electron Pairing and Superconductivity by Kinetic Renormalization in Correlated Electron Systems

1
National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
2
Hakodate Institute of Technology, 14-1 Tokura, Hakodate, Hokkaido 042-8501, Japan
*
Author to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 22 August 2018 / Accepted: 5 September 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Selected Papers from Quantum Complex Matter 2018)
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Abstract

We investigate the ground state of strongly correlated electron systems based on an optimization variational Monte Carlo method to clarify the mechanism of high-temperature superconductivity. The wave function is optimized by introducing variational parameters in an exponential-type wave function beyond the Gutzwiller function. The many-body effect plays an important role as an origin of superconductivity in a correlated electron system. There is a crossover between weakly correlated region and strongly correlated region, where two regions are characterized by the strength of the on-site Coulomb interaction U. We insist that high-temperature superconductivity occurs in the strongly correlated region. View Full-Text
Keywords: strongly correlated electron systems; mechanism of superconductivity; high-temperature superconductivity; kinetic mechanism of superconductivity; optimization variational Monte Carlo method; Hubbard model strongly correlated electron systems; mechanism of superconductivity; high-temperature superconductivity; kinetic mechanism of superconductivity; optimization variational Monte Carlo method; Hubbard model
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Yanagisawa, T.; Miyazaki, M.; Yamaji, K. Crossover Induced Electron Pairing and Superconductivity by Kinetic Renormalization in Correlated Electron Systems. Condens. Matter 2018, 3, 26.

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