scholarly journals Mott transition, magnetic and orbital orders in the ground state of the two-band Hubbard model using variational slave-spin mean field formalism

2021 ◽  
Author(s):  
Arun Kumar Maurya ◽  
Tahir Hossain Sarder ◽  
Amal Medhi
Keyword(s):  
Hubbard Model ◽  
Ground State ◽  
Mean Field ◽  
Mott Transition ◽  
Field Formalism

MOTT TRANSITION IN THE HALF-FILLED HUBBARD MODEL ON THE HONEYCOMB LATTICE WITHIN COHERENT POTENTIAL APPROXIMATION

2013 ◽  
Vol 27 (07) ◽  
pp. 1350046 ◽  
Author(s):  
DUC ANH LE
Keyword(s):  
Hubbard Model ◽  
Quantum Monte Carlo ◽  
Mean Field Theory ◽  
Mean Field ◽  
Coulomb Repulsion ◽  
Mott Transition ◽  
Coherent Potential Approximation ◽  
Honeycomb Lattice ◽  
Potential Approximation ◽  
Good Agreement

Using the coherent potential approximation, we study zero-temperature Mott transition in the half-filled Hubbard model on the honeycomb lattice. Although a pseudogap is already present for the non-interacting case, the gap will not occur until the onsite Coulomb repulsion exceeds a critical value U ≈ 3.6t, where t is the hopping integral. When increasing U/t, the density of states at the Fermi energy first goes up gradually from zero and after reaching a maximum it goes down to zero again. Our calculated critical interaction UC/t is in very good agreement with the ones obtained by quantum Monte Carlo simulation and cluster dynamical mean-field theory.

scholarly journals Band Degeneracy and the Mott Transition: Dynamical Mean Field Study

1997 ◽  
Vol 11 (06) ◽  
pp. 729-751 ◽  
Author(s):  
Henrik Kajueter ◽  
Gabriel Kotliar
Keyword(s):  
Hubbard Model ◽  
Field Study ◽  
Mean Field ◽  
Mott Transition ◽  
Band Model ◽  
Infinite Dimensions ◽  
Orbital Degeneracy ◽  
Atomic Exchange ◽  
The One

We investigate the Mott transition in infinite dimensions in the orbitally degenerate Hubbard model. We find that the qualitative features of the Mott transition found in the one-band model are also present in the orbitally degenerate case. Surprisingly, the quantitative aspects of the density driven Mott transition around density one are not very sensitive to orbital degeneracy, justifying the quantitative success of the one-band model which was previously applied to orbitally degenerate systems. We contrast this with quantities that have a sizeable dependence on the orbital degeneracy and comment on the role of the intra-atomic exchange J.

scholarly journals Topological Mott transition in a Weyl-Hubbard model: Dynamical mean-field theory study

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Bernhard Irsigler ◽  
Tobias Grass ◽  
Jun-Hui Zheng ◽  
Mathieu Barbier ◽  
Walter Hofstetter
Keyword(s):  
Field Theory ◽  
Hubbard Model ◽  
Mean Field Theory ◽  
Mean Field ◽  
Mott Transition ◽  
Dynamical Mean Field Theory

scholarly journals SUPERCONDUCTING ORDER PARAMETERS IN THE EXTENDED HUBBARD MODEL: A SIMPLE MEAN-FIELD STUDY

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2371-2383 ◽  
Author(s):  
J. S. THAKUR ◽  
M. P. DAS
Keyword(s):  
Hubbard Model ◽  
Nearest Neighbor ◽  
Mean Field ◽  
Order Parameters ◽  
Square Lattice ◽  
Extended Hubbard Model ◽  
Self Consistent ◽  
Frame Work ◽  
Field Formalism ◽  
Superconducting Pairing

The extended Hubbard model with nearest neighbor hopping and intersite interaction for a 2D square lattice has been studied within the frame work of a simple mean-field formalism. The self-consistent solutions of superconducting order parameters have been obtained for various fillings. The results indicate that superconducting pairing occurs on doping for the repulsive on-site U and attractive nearest neighbor V.

scholarly journals Slave-boson mean-field theory of the Mott transition in the two-band Hubbard model

2005 ◽  
Vol 48 (1) ◽  
pp. 55-64 ◽  
Author(s):  
A. Rüegg ◽  
M. Indergand ◽  
S. Pilgram ◽  
M. Sigrist
Keyword(s):  
Field Theory ◽  
Hubbard Model ◽  
Mean Field Theory ◽  
Mean Field ◽  
Mott Transition
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