Quantum phase diagram of the half filled Hubbard model with bond-charge interaction

2011 ◽  
Vol 843 (3) ◽  
pp. 767-783 ◽  
Author(s):  
A.O. Dobry ◽  
A.A. Aligia
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Quantum Phase ◽  
Charge Interaction ◽  
Bond Charge

T = 0 phase diagram of the 1D Hubbard model with magnetic interactions in the narrow band limit

Open Physics ◽  
2012 ◽  
Vol 10 (3) ◽  
Author(s):  
Ferdinando Mancini ◽  
Evgeny Plekhanov ◽  
Gerardo Sica
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Narrow Band ◽  
Operator Method ◽  
Magnetic Interactions ◽  
Exchange Constant ◽  
Local Charge ◽  
Spin Interactions ◽  
Charge Interaction ◽  
Composite Operator Method

AbstractIn this paper we study a generalization of the Hubbard model by considering spin-spin interactions described by the exchange constant J. An external magnetic field his also taken into account. In the narrowband limit and for the 1D case, we present the exact solution obtained in the framework of the Green’s function formalism, using the Composite Operator Method. We report the T = 0 phase diagram for both ferro (J > 0) and anti-ferro (J < 0) couplings. The competition of the different energy scales (U, J, and h; being U the local charge interaction) generates a variety of phases and different charge and spin orderings.

scholarly journals Quantum phase diagram of a Moiré-Hubbard model

2020 ◽  
Vol 102 (20) ◽  
Author(s):  
Haining Pan ◽  
Fengcheng Wu ◽  
Sankar Das Sarma
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Quantum Phase
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