scholarly journals FLEX+DMFT approach to thed-wave superconducting phase diagram of the two-dimensional Hubbard model

2015 ◽  
Vol 92 (8) ◽  
Author(s):  
Motoharu Kitatani ◽  
Naoto Tsuji ◽  
Hideo Aoki
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Superconducting Phase ◽  
Two Dimensional

scholarly journals Fidelity study of the superconducting phase diagram in the two-dimensional single-band Hubbard model

2011 ◽  
Vol 84 (12) ◽  
Author(s):  
C. J. Jia ◽  
B. Moritz ◽  
C.-C. Chen ◽  
B. Sriram Shastry ◽  
T. P. Devereaux
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Superconducting Phase ◽  
Single Band ◽  
Two Dimensional

Phase diagram of cuprate high-temperature superconductors based on the optimization Monte Carlo method

2020 ◽  
Vol 34 (19n20) ◽  
pp. 2040046
Author(s):  
T. Yanagisawa ◽  
M. Miyazaki ◽  
K. Yamaji
Keyword(s):  
Phase Diagram ◽  
Monte Carlo ◽  
Wave Function ◽  
High Temperature ◽  
Hubbard Model ◽  
Ground State ◽  
State Energy ◽  
High Temperature Superconductivity ◽  
Two Dimensional ◽  
Text Model

It is important to understand the phase diagram of electronic states in the CuO2 plane to clarify the mechanism of high-temperature superconductivity. We investigate the ground state of electronic models with strong correlation by employing the optimization variational Monte Carlo method. We consider the two-dimensional Hubbard model as well as the three-band [Formula: see text]–[Formula: see text] model. We use the improved wave function that takes account of inter-site electron correlation to go beyond the Gutzwiller wave function. The ground state energy is lowered considerably, which now gives the best estimate of the ground state energy for the two-dimensional Hubbard model. The many-body effect plays an important role as an origin of spin correlation and superconductivity in correlated electron systems. We investigate the competition between the antiferromagnetic state and superconducting state by varying the Coulomb repulsion [Formula: see text], the band parameter [Formula: see text] and the electron density [Formula: see text] for the Hubbard model. We show phase diagrams that include superconducting and antiferromagnetic phases. We expect that high-temperature superconductivity occurs near the boundary between antiferromagnetic phase and superconducting one. Since the three-band [Formula: see text]–[Formula: see text] model contains many-band parameters, high-temperature superconductivity may be more likely to occur in the [Formula: see text]–[Formula: see text] model than in single-band models.

scholarly journals Incommensurate Spin-Density Wave in Two-Dimensional Hubbard Model

2012 ◽  
Vol 190 ◽  
pp. 67-70 ◽  
Author(s):  
M.A. Timirgazin ◽  
Anatoly K. Arzhnikov ◽  
A.V. Vedyayev
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Ground State ◽  
Magnetic Phase ◽  
Density Wave ◽  
Spin Density Wave ◽  
Magnetic Phase Diagram ◽  
Two Dimensional ◽  
Magnetic Phases ◽  
Model Relation

We consider the magnetic phase diagram of the two-dimensional Hubbard model ona square lattice.We take into account both spiral and collinear incommensurate magnetic states.The possibility of phase separation of spiral magnetic phases is taken into consideration as well.Our study shows that all the listed phases appear to be the ground state at certain parametersof the model. Relation of the obtained results to real materials, e.g. Cu-based high-temperaturesuperconductors, is discussed.

scholarly journals Superconducting Phase Diagram of the Paramagnetic One-Band Hubbard Model

2016 ◽  
Vol 30 (1) ◽  
pp. 85-89 ◽  
Author(s):  
Andreas Kreisel ◽  
Astrid T. Rømer ◽  
P. J. Hirschfeld ◽  
Brian M. Andersen
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Superconducting Phase

scholarly journals Emergent BCS regime of the two-dimensional fermionic Hubbard model: Ground-state phase diagram

2015 ◽  
Vol 110 (5) ◽  
pp. 57001 ◽  
Author(s):  
Youjin Deng ◽  
Evgeny Kozik ◽  
Nikolay V. Prokof'ev ◽  
Boris V. Svistunov
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Ground State ◽  
Two Dimensional ◽  
Ground State Phase Diagram

scholarly journals Phase diagram of the two-dimensional Anderson-Hubbard model

1994 ◽  
Vol 49 (22) ◽  
pp. 15920-15927 ◽  
Author(s):  
Jaichul Yi ◽  
Lizeng Zhang ◽  
Geoff S. Canright
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Two Dimensional
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