Effects of Fermi-surface topology on the electronic properties of the two-dimensional {ital t}-{ital t}{prime} model

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.1152· OSTI ID:76443

Chen, L ^[1]; Benard, P ^[2]

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1. Departement de Physique and Centre de Recherche en Physique du Solide, Universite de Sherbrooke, Sherbrooke, Quebec, J1K2R1 (Canada)
2. Institut de Recherche sur l`Hydrogene, Universite du Quebec a Trois-Rivieres, Trois-Rivieres, Quebec, G9A5H7 (Canada)

We present a study of the two-dimensional {ital t}-{ital t}{prime} model in the parameter regime of {vert_bar}{ital t}{prime}{vert_bar}{gt}{vert_bar}{ital t}{vert_bar}/2. As a function of band filling, the Fermi surface exhibits rich geometrical and topological properties, which have significant impact on the physical properties of the normal state. In particular, the Fermi surface becomes nested when the chemical potential reaches {minus}{ital t}{sup 2}/{ital t}{prime}, where the nesting vectors are [2 arccos({ital t}/2{ital t}{prime}),0] and [0,2 arccos({ital t}/2{ital t}{prime})]. The normal-state properties, such as the transport properties and charge and spin fluctuations, are analyzed in relation with the geometrical properties of the Fermi surface. We show that these properties lead to an optical charge-density wave mode within the random-phase approximation, even if the Hubbard interaction is repulsive. Implications for the recently introduced antiferromagnetic--van Hove model are also discussed.

• OSTI ID: 76443
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CRYSTAL MODELS
ELECTRONIC STRUCTURE
FERMI LEVEL
FLUCTUATIONS
MAGNETIC PROPERTIES
QUASI PARTICLES
TOPOLOGY
TWO-DIMENSIONAL CALCULATIONS