Stability of the split-band solution and energy gap in the narrow-band region of the Hubbard model

1980 ◽  
Vol 21 (8) ◽  
pp. 3309-3319 ◽  
Author(s):  
Tadashi Arai ◽  
Morrel H. Cohen
Keyword(s):  
Hubbard Model ◽  
Energy Gap ◽  
Narrow Band ◽  
Band Region ◽  
Split Band

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.

The Hubbard model: Insulator or conductor for narrow band regime?

1969 ◽  
Vol 30 (7) ◽  
pp. 418-419 ◽  
Author(s):  
R.A. Bari ◽  
R.V. Lange
Keyword(s):  
Hubbard Model ◽  
Narrow Band

Narrow-Band Expansions in the Hubbard Model: A Comment

1970 ◽  
Vol 2 (6) ◽  
pp. 2260-2261 ◽  
Author(s):  
Robert A. Bari
Keyword(s):  
Hubbard Model ◽  
Narrow Band

Comment on 'narrow band solution to the Hubbard model'

1971 ◽  
Vol 4 (15) ◽  
pp. 2432-2432
Author(s):  
J A Blackman ◽  
D M Esterling
Keyword(s):  
Hubbard Model ◽  
Narrow Band

Narrow-Band-Gap Polymer Photovoltaic Materials Synthesis and Photovoltaic Research

2013 ◽  
Vol 273 ◽  
pp. 468-472
Author(s):  
Yong Sen Wei
Keyword(s):  
Band Gap ◽  
Energy Gap ◽  
Narrow Band ◽  
Field Effect Transistors ◽  
Materials Synthesis ◽  
Photovoltaic Properties ◽  
Light Emitting ◽  
Photovoltaic Materials ◽  
Photovoltaic Characteristics ◽  
Photovoltaic Material

In recent years, research of the narrow-band-gap polymer photovoltaic (PV) materials in the field of light-emitting diodes, field effect transistors, solar cells and sensors has made tremendous progress and its application becomes more widely. In order to obtain a better performance of the photovoltaic material, in the process of design the polymer, we must consider the spectral range, the energy gap, the balance between the LUMO and HOMO level. Through the analysis of the narrow-band-gap polymers, this paper described the synthesis of the photovoltaic material, and detailed analyzes its photovoltaic characteristics. This paper introduces the double bonds to combine DTBT receptors and different electron donor, to synthesize new narrow-band-gap polymer photovoltaic materials with photovoltaic properties.

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