scholarly journals Doping-driven metal-insulator transitions and charge orderings in the extended Hubbard model

2017 ◽  
Vol 95 (12) ◽  
Author(s):  
K. J. Kapcia ◽  
S. Robaszkiewicz ◽  
M. Capone ◽  
A. Amaricci
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Metal Insulator ◽  
Charge Orderings

scholarly journals Thermodynamics of the metal-insulator transition in the extended Hubbard model

2019 ◽  
Vol 6 (6) ◽  
Author(s):  
Malte Schüler ◽  
Erik van Loon ◽  
Mikhail Katsnelson ◽  
Tim Wehling
Keyword(s):  
Hubbard Model ◽  
Fermi Liquid ◽  
Insulator Transition ◽  
Extended Hubbard Model ◽  
Metal Insulator Transition ◽  
Local Interactions ◽  
Metal Insulator ◽  
First Order ◽  
Local Correlations ◽  
Non Local

In contrast to the Hubbard model, the extended Hubbard model, which additionally accounts for non-local interactions, lacks systemic studies of thermodynamic properties especially across the metal-insulator transition. Using a variational principle, we perform such a systematic study and describe how non-local interactions screen local correlations differently in the Fermi-liquid and in the insulator. The thermodynamics reveal that non-local interactions are at least in parts responsible for first-order metal-insulator transitions in real materials.

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