STRIPE PHASE OF THE EXTENDED HUBBARD MODEL

2003 ◽  
Vol 17 (04n06) ◽  
pp. 573-577
Author(s):  
ROBERTA CITRO
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Low Energy ◽  
Extended Hubbard Model ◽  
Cumulant Expansion ◽  
Charge Fluctuations ◽  
Perturbative Approach ◽  
Stripe Phase ◽  
Energy Behavior ◽  
Stripe Order

Within a strong-coupling perturbative approach, based on a Cumulant Expansion of the extended single-band Hubbard model, we analyze the low-energy behavior of the chargevertex function. It is shown that quantum critical charge fluctuations drive the system towards a stripe-phase characterized by a finite wave-vector that yields information on the stripe order. Some relevant features observed in ARPES experiments on Bi2212 and LSCO are qualitatively reproduced.

Renormalization from Density Functional Theory to Strong Coupling Models for the Electronic Structure of La2CuO4

1989 ◽  
Vol 169 ◽  
Author(s):  
Mark S. Hybertsen ◽  
Michael Schluter ◽  
E.B. Stechel ◽  
D.R. Jennison
Keyword(s):  
Electronic Structure ◽  
Hubbard Model ◽  
Strong Coupling ◽  
Density Functional ◽  
Nearest Neighbor ◽  
Quantitative Agreement ◽  
Energy Scale ◽  
Low Energy ◽  
Energy Spectra ◽  
Functional Theory

AbstractStrong coupling models for the electronic structure of La2CuO4 are derived in two successive stages of renormalization. First, a three-band Hubbard model is derived using a constrained density functional approach. Second, exact diagonalization studies of finite clusters within the three band Hubbard model are used to select and map the low energy spectra onto effective one-band Hamiltonians. At each stage, some observables are calculated and found to be in quantitative agreement with experiment. The final results suggest the following models to be adequate descriptions of the low energy scale dynamics: (1) a spin 1/2 Heisenberg model for the insulating case with nearest neighbor J≈130 meV; (2) a "t–t'–J" model with nearly identical parameters for the electron and hole doped cases.

Quarter-Filled Extended Hubbard Model at Strong Coupling

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3339-3342 ◽  
Author(s):  
W. F. Lee ◽  
H. Q. Lin
Keyword(s):  
Hubbard Model ◽  
Strong Coupling ◽  
Coulomb Interaction ◽  
State Energy ◽  
Nearest Neighbor ◽  
Spin Correlation ◽  
Perturbation Approach ◽  
Effective Hamiltonian ◽  
Extended Hubbard Model ◽  
One Dimensional

We apply a perturbation approach to study the quarter-filled extended Hubbard model at strong coupling limit. An effective Hamiltonian up to sixth order in t/U and t/V (t defines electron hopping, U defines on-site Coulomb interaction, and V defines nearest-neighbor Coulomb interaction) for one-dimensional chains was obtained. The spin-spin correlation functions were involved, which can be obtained after comparing to the ground state energy numerically obtained from the phase diagram.

Pairing by dynamic charge fluctuations in the extended Hubbard model

1990 ◽  
Vol 42 (7) ◽  
pp. 4865-4868 ◽  
Author(s):  
Yunkyu Bang ◽  
Khandker Quader ◽  
Elihu Abrahams ◽  
Peter B. Littlewood
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Charge Fluctuations ◽  
Dynamic Charge

scholarly journals Spin-Triplet Superconductivity Induced by Charge Fluctuations in Extended Hubbard Model

2005 ◽  
Vol 74 (9) ◽  
pp. 2579-2585 ◽  
Author(s):  
Seiichiro Onari ◽  
Ryotaro Arita ◽  
Kazuhiko Kuroki ◽  
Hideo Aoki
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Charge Fluctuations ◽  
Spin Triplet

Charge fluctuations in the four-band extended Hubbard model

1995 ◽  
Vol 52 (9) ◽  
pp. 6880-6893 ◽  
Author(s):  
F. Bucci ◽  
C. Castellani ◽  
C. Di Castro ◽  
M. Grilli
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Charge Fluctuations

PHASE DIAGRAM OF STRIPE ORDER IN THE EXTENDED HUBBARD MODEL

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3508-3513 ◽  
Author(s):  
MASARU KATO
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Nearest Neighbor ◽  
Mean Field ◽  
Field Approximation ◽  
Square Lattice ◽  
Mean Field Approximation ◽  
Extended Hubbard Model ◽  
Stable States ◽  
Stripe Order

The extended Hubbard model with the nearest-neighbor Coulomb interaction on the square lattice is studied within the mean-field approximation. The stable states for 8×8 sites lattice with the periodic boundary condition and the electron filling n=0.875, as well as for 10×10 lattice and n=0.80, are obtained. For 8×8 lattice where quarter-filled straight stripe is expected because of the long-range Coulomb interaction, the cross stripe phases become stable.

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