Superconductivity in the Two-Chain Hubbard Model Including the Interchain Coulomb Interaction

1996 ◽  
Vol 65 (1) ◽  
pp. 327-328 ◽  
Author(s):  
Soh Koike ◽  
Kunihiko Yamaji
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction

Screened Coulomb interaction or Hubbard model?

1991 ◽  
Vol 177 (1-3) ◽  
pp. 578-584 ◽  
Author(s):  
Daniel C. Mattis ◽  
Douglas Henderson
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction

scholarly journals Striped phases in the two-dimensional Hubbard model with long-range Coulomb interaction

1998 ◽  
Vol 58 (20) ◽  
pp. 13506-13509 ◽  
Author(s):  
G. Seibold ◽  
C. Castellani ◽  
C. Di Castro ◽  
M. Grilli
Keyword(s):  
Hubbard Model ◽  
Long Range ◽  
Coulomb Interaction ◽  
Two Dimensional ◽  
Striped Phases

PHASE SEPARATION IN THE TWO-DIMENSIONAL HUBBARD MODEL

2005 ◽  
Vol 19 (01n03) ◽  
pp. 299-302 ◽  
Author(s):  
M. YU ◽  
H. Q. LIN
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Coulomb Interaction ◽  
Single Band ◽  
Study Phase ◽  
Two Dimensional ◽  
Stripe Phase ◽  
Hartree Fock ◽  
Band Filling

In this paper, we study phase separation in the two-dimensional single-band Hubbard model with the unrestricted Hartree-Fock(UHF) method and the restricted Hartree-Fock (RHF) method. We perform the calculation for square lattices and rectangle lattices. It is observed that the stripe phase exists and it depends on three aspects: geometry of the lattice, Coulomb interaction U and band filling n. To gain more physical insights, we consider the Hubbard model with spin dependent hoppings: t↑ and t↓, and study the effect of varying [Formula: see text] on the phase separation.

A VARIATIONAL THEORY OF QUASI-PARTICLES IN A 3D N x N x N CUBIC LATTICE

2014 ◽  
Vol 5 (1) ◽  
pp. 712-725
Author(s):  
Enaibe A. Edison ◽  
Akpata Erhieyovwe ◽  
Osafile Omosede
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Interaction Strength ◽  
Finite Size ◽  
Electron System ◽  
Single Band ◽  
Variational Theory ◽  
S Wave ◽  
Cubic Lattice ◽  
Hubbard Hamiltonian

The single-band Hubbard Hamiltonian study faces a serious limitation and difficulty as we move away from finite - size lattices to larger N - dimensional lattices. Thus there is the needto develop the means of overcoming the finite - size lattice defects as we pass on to a higher dimension.In this work, a quantitative approximation to the one-band Hubbard model is presented using a variational analytic approach. The goal of this work, therefore, is to explore quantitatively the lowest ground-state energy and the pairing correlations in 3D N x N x N lattices of the Hubbard model. We developed the unit step model as an approximate solution to the single-band Hubbard Hamiltonian to solve variationallythe correlation of two interacting elections on a three-dimensional cubic lattice. We also showed primarily how to derive possible electronic states available for several even and odd3D lattices, although, this work places more emphasis on a 3D 5 x 5 x 5 lattice. The results emerging from our present study compared favourablywith the results of Gutzwillervariational approach (GVA) and correlated variational approach (CVA), at thelarge limit of the Coulomb interaction strength (U/4t). It is revealed in this study, that the repulsive Coulomb interaction which in part leads to the strong electronic correlations, would indicate that the two electron system prefer not to condense into s-wave superconducting singlet state (s = 0), at high positive values of the interaction strength.

Effect of the intersite Coulomb interaction in the extended Hubbard model

1992 ◽  
Vol 46 (6) ◽  
pp. 3668-3671 ◽  
Author(s):  
Mei-Rong Li ◽  
Yong-Jun Wang ◽  
Chang-De Gong
Keyword(s):  
Hubbard Model ◽  
Coulomb Interaction ◽  
Extended Hubbard Model ◽  
Intersite Coulomb Interaction
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