scholarly journals Optical Conductivity in a Two-Dimensional Extended Hubbard Model for an Organic Dirac Electron System α-(BEDT-TTF)2I3

Crystals ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 137 ◽  
Author(s):  
Daigo Ohki ◽  
Genki Matsuno ◽  
Yukiko Omori ◽  
Akito Kobayashi
Keyword(s):  
Hubbard Model ◽  
Optical Conductivity ◽  
Electron System ◽  
Two Dimensional ◽  
Extended Hubbard Model ◽  
Dirac Electron

scholarly journals Ambient-pressure Dirac electron system in the quasi-two-dimensional molecular conductor α−(BETS)2I3

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Shunsuke Kitou ◽  
Takao Tsumuraya ◽  
Hikaru Sawahata ◽  
Fumiyuki Ishii ◽  
Ko-ichi Hiraki ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Electron System ◽  
Two Dimensional ◽  
Molecular Conductor ◽  
Dirac Electron

TWO-DIMENSIONAL QUARTER-FILLED EXTENDED HUBBARD MODEL AT STRONG COUPLING

2005 ◽  
Vol 19 (01n03) ◽  
pp. 213-216
Author(s):  
W. F. LEE ◽  
H. Q. LIN
Keyword(s):  
Hubbard Model ◽  
Correlation Functions ◽  
Nearest Neighbor ◽  
Spin Correlation ◽  
Perturbation Approach ◽  
Effective Hamiltonian ◽  
Two Dimensional ◽  
Extended Hubbard Model ◽  
Neighbor Interaction ◽  
Electron Hopping

In this paper, we generalized the perturbation approach to study the quasi-two-dimension extended Hubbard model. This model is characterizing by intra-chain electron hopping t, on-site Column interaction U, nearest-neighbor interaction V, and inter-chain electron hopping t′ and nearest-neighbor interaction V′. An effective Hamiltonian up to sixth-order in t/U, t/V, t/V′, t′/U, t′/V and t′/V′ expansion was obtained and the spin-spin correlation functions were calculated. We presented results for t=t′, V=V′.

scholarly journals Large Diamagnetism and Electromagnetic Duality in Two-Dimensional Dirac Electron System

2022 ◽  
Vol 128 (2) ◽  
Author(s):  
S. Fujiyama ◽  
H. Maebashi ◽  
N. Tajima ◽  
T. Tsumuraya ◽  
H-B. Cui ◽  
...  
Keyword(s):  
Electron System ◽  
Two Dimensional ◽  
Dirac Electron

SINGLE-PARTICLE AND OPTICAL EXCITATIONS IN DOPED MOTT- HUBBARD INSULATORS

1992 ◽  
Vol 06 (05n06) ◽  
pp. 589-602 ◽  
Author(s):  
WALTER STEPHAN ◽  
PETER HORSCH
Keyword(s):  
Optical Properties ◽  
Band Structure ◽  
Fermi Surface ◽  
Copper Oxide ◽  
Hubbard Model ◽  
Optical Conductivity ◽  
Single Particle ◽  
Oxide Superconductors ◽  
Two Dimensional ◽  
Copper Oxide Superconductors

Recent numerical results for the single-particle spectral function and optical conductivity of the two-dimensional Hubbard and t−J models are reviewed. Already for two holes in systems of sixteen to twenty sites (≥ 10% doping) a large electronic Fermi surface, compatible with Luttinger’s theorem, is observed. The full single-particle Green’s function is examined, and is shown to exhibit quasiparticle-like behavior, with dispersion consistent with the band structure of the non-interacting limit, and band width scaling approximately as J for J smaller than t. The optical conductivity of the Hubbard and t−J models is shown to have many features in common with recent experiments on copper oxide superconductors. The importance of the often neglected 3-site terms which arise in the derivation of the t−J model from the Hubbard model for optical properties is discussed.

Finite-Temperature Optical Conductivity of the Two-Dimensional Hubbard Model

1994 ◽  
Vol 22 (3) ◽  
pp. 273-276 ◽  
Author(s):  
Wen-Zhu Li ◽  
Feng Chen ◽  
Tie-feng Xu ◽  
He-ping Ying
Keyword(s):  
Hubbard Model ◽  
Optical Conductivity ◽  
Finite Temperature ◽  
Two Dimensional
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