Crossover-Induced Spin Fluctuation and Electron Pairing in Strongly Correlated Electrons

We investigate the two-dimensional (2D) Hubbard model and d-p model as a model for cuprate high-temperature superconductors, by employing an optimized variational Monte Carlo method. We improved the many-body wave function starting from the simple Gutzwiller function. On the basis of optimized varia...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2018-03, Vol.31 (3), p.785-790
Main Authors: Yanagisawa, Takashi, Miyazaki, Mitake, Yamaji, Kunihiko
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON CORRELATION
ELECTRON-ELECTRON INTERACTIONS
FLUCTUATIONS
GROUND STATES
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
Magnetic Materials
Magnetism
MANY-BODY PROBLEM
Original Paper
PAIRING INTERACTIONS
Physics
Physics and Astronomy
SPIN
Strongly Correlated Systems
SUPERCONDUCTIVITY
TWO-DIMENSIONAL CALCULATIONS
VARIATIONAL MONTE CARLO METHOD
WAVE FUNCTIONS
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Summary:We investigate the two-dimensional (2D) Hubbard model and d-p model as a model for cuprate high-temperature superconductors, by employing an optimized variational Monte Carlo method. We improved the many-body wave function starting from the simple Gutzwiller function. On the basis of optimized variational wave functions, we show that there is a superconducting phase in the ground state of the 2D Hubbard model. The on-site repulsive Coulomb interaction U can bring about high-temperature superconductivity because its characteristic energy is of the order of eV. The attractive interaction between electrons is induced by the crossover from weakly to strongly correlated regions. High-temperature superconductivity is possible in the strongly correlated region, where U is greater than the bandwidth.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-017-4424-7