scholarly journals One-particle spectral weight of the three-dimensional single-band Hubbard model

1996 ◽  
Vol 54 (23) ◽  
pp. 16523-16532 ◽  
Author(s):  
M. Ulmke ◽  
R. T. Scalettar ◽  
A. Nazarenko ◽  
E. Dagotto
Keyword(s):  
Hubbard Model ◽  
Three Dimensional ◽  
Spectral Weight ◽  
Single Band

Effective Single-Band Hamiltonian for the Three-Dimensional Hubbard Model

1993 ◽  
Vol 176 (2) ◽  
pp. 441-450 ◽  
Author(s):  
J. J. Rodríguez-núntez ◽  
R. Medina ◽  
P. Silva
Keyword(s):  
Hubbard Model ◽  
Three Dimensional ◽  
Single Band

scholarly journals Spectral properties of the three-dimensional Hubbard model

2011 ◽  
Vol 83 (23) ◽  
Author(s):  
Sebastian Fuchs ◽  
Emanuel Gull ◽  
Matthias Troyer ◽  
Mark Jarrell ◽  
Thomas Pruschke
Keyword(s):  
Hubbard Model ◽  
Spectral Properties ◽  
Three Dimensional

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.

scholarly journals Emergence of quasiparticles in a doped Mott insulator

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Yao Wang ◽  
Yu He ◽  
Krzysztof Wohlfeld ◽  
Makoto Hashimoto ◽  
Edwin W. Huang ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Single Layer ◽  
Mott Insulator ◽  
Spectral Weight ◽  
Particle Spectrum ◽  
Electron Hole ◽  
Strong Electron ◽  
Side Band ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Weakly Coupled

AbstractHow a Mott insulator develops into a weakly coupled metal upon doping is a central question to understanding various emergent correlated phenomena. To analyze this evolution and its connection to the high-Tc cuprates, we study the single-particle spectrum for the doped Hubbard model using cluster perturbation theory on superclusters. Starting from extremely low doping, we identify a heavily renormalized quasiparticle dispersion that immediately develops across the Fermi level, and a weakening polaronic side band at higher binding energy. The quasiparticle spectral weight roughly grows at twice the rate of doping in the low doping regime, but this rate is halved at optimal doping. In the heavily doped regime, we find both strong electron-hole asymmetry and a persistent presence of Mott spectral features. Finally, we discuss the applicability of the single-band Hubbard model to describe the evolution of nodal spectra measured by angle-resolved photoemission spectroscopy (ARPES) on the single-layer cuprate La2−xSrxCuO4 (0 ≤ x ≤ 0.15). This work benchmarks the predictive power of the Hubbard model for electronic properties of high-Tc cuprates.

REENTRANT CHARGE ORDERING BEHAVIOUR IN THE EXTENDED HUBBARD MODEL

2001 ◽  
Vol 15 (26) ◽  
pp. 1217-1224 ◽  
Author(s):  
ANH TUAN HOANG
Keyword(s):  
Hubbard Model ◽  
Three Dimensional ◽  
Charge Ordering ◽  
Coherent Potential Approximation ◽  
Coulomb Energy ◽  
Extended Hubbard Model ◽  
Potential Approximation ◽  
Ordering Transition

We study the charge ordering behavior in a three-dimensional extended Hubbard model using the Coherent potential approximation (CPA). It is shown that the charge ordering transition occurs due to the competition between kinetic and Coulomb energy. At various band fillings a simple reentrant behavior of the charge ordering transition is found.

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