Phase diagram of an extended Hubbard model with correlated hopping at half filling

Journal Article · Mon May 15 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.13774· OSTI ID:69467

Aligia, A A; Arrachea, L; Gagliano, E R ^[1]

---

1. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 S.C. de Bariloche (Argentina)

We study a generalized Hubbard model with on-site interaction {ital U}, nearest-neighbor repulsion {ital V}, and general correlated hopping under the condition that the number of doubly occupied sites is conserved. We find the exact ground state (GS) in arbitrary dimension in two wide regions of parameters. In one of them the GS is a Mott insulator (MI) and in the other it is a charge-density wave (CDW). The boundary of the MI and a large part of that of the CDW are determined exactly for relevant lattices. We study numerically the effect of relaxing the above-mentioned condition.

• OSTI ID: 69467
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CUBIC LATTICES
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRON CORRELATION
GROUND STATES
HUBBARD MODEL
METALS
SUPERCONDUCTIVITY