Violation of the Luttinger sum rule within the Hubbard model on a triangular lattice
نویسنده
چکیده
The frequency-moment expansion method is developed to analyze the validity of the Luttinger sum rule within the Mott-Hubbard insulator, as represented by the generalized Hubbard model at half filling and large U . For the particular case of the Hubbard model with nearest-neighbor hopping on a triangular lattice lacking the particle-hole symmetry results reveal substantial violation of the sum rule. PACS. 71.10.-w Theories and models of many-electron systems – 71.27.+a Strongly correlated electron systems; heavy fermions – 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
منابع مشابه
Comment on"Breakdown of the Luttinger sum rule within the Mott-Hubbard insulator", by J. Kokalj and P. Prelovsek [Phys. Rev. B 78, 153103 (2008), arXiv:arXiv:0803.4468]
On the basis of an analysis of the numerical results corresponding to the half-filled one-dimensional t-t′-V model on some finite lattices, Kokalj and Prelovšek (KP) have in a recent paper [Phys. Rev. B 78, 153103 (2008)] concluded that the Luttinger theorem does not apply for the Mott-Hubbard (MH) insulating phase of this model (corresponding to the region V ≫ t) in the thermodynamic limit; KP...
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تاریخ انتشار 2008