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Keywords = kinetic driven superconductivity

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10 pages, 596 KB  
Article
On the Kinetic Energy Driven Superconductivity in the Two-Dimensional Hubbard Model
by Takashi Yanagisawa, Kunihiko Yamaji and Mitake Miyazaki
Condens. Matter 2021, 6(1), 12; https://doi.org/10.3390/condmat6010012 - 26 Feb 2021
Cited by 2 | Viewed by 3685
Abstract
We investigate the role of kinetic energy for the stability of superconducting state in the two-dimensional Hubbard model on the basis of an optimization variational Monte Carlo method. The wave function is optimized by multiplying by correlation operators of site off-diagonal type. This [...] Read more.
We investigate the role of kinetic energy for the stability of superconducting state in the two-dimensional Hubbard model on the basis of an optimization variational Monte Carlo method. The wave function is optimized by multiplying by correlation operators of site off-diagonal type. This wave function is written in an exponential-type form given as ψλ=exp(λK)ψG for the Gutzwiller wave function ψG and a kinetic operator K. The kinetic correlation operator exp(λK) plays an important role in the emergence of superconductivity in large-U region of the two-dimensional Hubbard model, where U is the on-site Coulomb repulsive interaction. We show that the superconducting condensation energy mainly originates from the kinetic energy in the strongly correlated region. This may indicate a possibility of high-temperature superconductivity due to the kinetic energy effect in correlated electron systems. Full article
(This article belongs to the Special Issue Quantum Complex Matter 2020)
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22 pages, 641 KB  
Article
Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems
by Takashi Yanagisawa
Condens. Matter 2019, 4(2), 57; https://doi.org/10.3390/condmat4020057 - 19 Jun 2019
Cited by 15 | Viewed by 8333
Abstract
It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. In the first half of this paper, we give a brief review on mechanisms of superconductivity in many-electron systems. We believe that high-temperature superconductivity may occur in a [...] Read more.
It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. In the first half of this paper, we give a brief review on mechanisms of superconductivity in many-electron systems. We believe that high-temperature superconductivity may occur in a system with interaction of large-energy scale. Empirically, this is true for superconductors that have been found so far. In the second half of this paper, we discuss cuprate high-temperature superconductors. We argue that superconductivity of high temperature cuprates is induced by the strong on-site Coulomb interaction, that is, the origin of high-temperature superconductivity is the strong electron correlation. We show the results on the ground state of electronic models for high temperature cuprates on the basis of the optimization variational Monte Carlo method. A high-temperature superconducting phase will exist in the strongly correlated region. Full article
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
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