Charge gaps and quasiparticle bands of the ionic Hubbard model

European Physical Journal B

Volumn 44, Issue 1, 2005, Pages 47-55

  Jabben, T ^a   Grewe, N ^a   Anders, F B ^b  

^a DARMSTADT UNIVERSITY OF TECHNOLOGY   (Germany)

^b UNIVERSITY OF BREMEN   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

APPROXIMATION THEORY; CRYSTAL LATTICES; ELECTRIC CHARGE; ELECTRIC EXCITATION; ELECTRIC INSULATORS; FERMI LIQUIDS; FERMIONS; HAMILTONIANS; METAL INSULATOR TRANSITION; MONTE CARLO METHODS; QUANTUM THEORY;

CHARGE GAPS; HYBRIDIZATION MECHANISM; IONIC HUBBARD MODEL; QUASIPARTICLE BANDS;

BAND STRUCTURE;

EID: 17744372893     PISSN: 14346028     EISSN: None     Source Type: Journal    
DOI: 10.1140/epjb/e2005-00098-2     Document Type: Article

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43. This term also seems appropriate for the following reason: The Hubbard I-approximation may be reformulated with a perturbation expansion with respect to hopping or hybridization to neighbours. In this frame the Free Theory encorporates all processes not containing local cummulant vertices and realizes as such a very general approximation scheme in which Wicks theorem is formally applicable and propagation through the lattice is free