scholarly journals Strong-coupling approach to Mott transition of massless and massive Dirac fermions on honeycomb lattice

2016 ◽  
Vol 93 (7) ◽  
Author(s):  
Elaheh Adibi ◽  
S. Akbar Jafari
Keyword(s):  
Strong Coupling ◽  
Mott Transition ◽  
Honeycomb Lattice ◽  
Dirac Fermions ◽  
Coupling Approach

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 Strong coupling approach to the supersymmetric Kondo model

2000 ◽  
Vol 586 (3) ◽  
pp. 641-667 ◽  
Author(s):  
P Coleman ◽  
C Pépin ◽  
A.M Tsvelik
Keyword(s):  
Strong Coupling ◽  
Kondo Model ◽  
Coupling Approach

scholarly journals Energy Spectrum of 51V by the Intermediate Coupling Approach

1974 ◽  
Vol 27 (2) ◽  
pp. 289 ◽  
Author(s):  
Woon-Hyuk Chung
Keyword(s):  
Energy Spectrum ◽  
Shell Model ◽  
Strong Coupling ◽  
Energy Levels ◽  
Coupling Model ◽  
Intermediate Coupling ◽  
Rotational Model ◽  
Model Calculations ◽  
Coupling Approach ◽  
Intermediate Coupling Model

In recent years the nucleus 51 Y has been extensively studied, both experimentally by Horoshko et al. (1970), using the 48Ti(oc, py)51y reaction, and theoretically in terms of shell model calculations by many authors (McCullen et al. 1964; Horoshko et al. 1970; Lips and McEllistrem 1970). Mixed configuration shell model calculations by Lips and McEllistrem, in particular, have successfully reproduced the low-lying energy levels of5ly. However, strong coupling rotational model calculations by Malik and Scholz (1966) did not give satisfactory results. In the present work, the intermediate coupling unified model (Bohr and Mottelson 1953; Choudhury 1954) is applied to Sly. The purpose of this work is to show that the intermediate coupling model can successfully predict the low-lying energy levels of Sly.

No Mass Gap Phase Transition in Novel Massless Dirac Fermion Material

2021 ◽  
Vol 1 ◽  
Keyword(s):  
Phase Transition ◽  
Strong Coupling ◽  
Quantum Phase Transition ◽  
Dirac Fermion ◽  
Strong Coupling Regime ◽  
Dirac Fermions ◽  
Fermion System ◽  
Mass Gap ◽  
Gap Phase ◽  
Massless Dirac Fermion

Using an organic massless Dirac fermion system, we found that massless Dirac fermions undergo a quantum phase transition without creating any mass gap even in the strong coupling regime.

High-pressure superconductivity in yttrium: The strong-coupling approach

2015 ◽  
Vol 219 ◽  
pp. 1-6 ◽  
Author(s):  
Marcin W. Jarosik ◽  
Izabela A. Wrona ◽  
Anna M. Duda
Keyword(s):  
High Pressure ◽  
Strong Coupling ◽  
Coupling Approach
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