Superconductivity in an exactly solvable Hubbard model with bond-charge interaction

Journal Article · Sat Apr 15 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.10386· OSTI ID:44611

Schadschneider, A ^[1]

---

1. Institute for Theoretical Physics, State University of New York at Stony Brook, Stony Brook, New York 11794-3840 (United States)

The Hubbard model with an additional bond-charge interaction {ital X} is solved exactly in one dimension for the case {ital t}={ital X}, where {ital t} is the hopping amplitude. In this case the number of doubly occupied sites is conserved. In the sector with no double occupations the model reduces to the {ital U}={infinity} Hubbard model. In arbitrary dimensions the qualitative form of the phase diagram is obtained. It is shown that for moderate Hubbard interactions {ital U} the model has superconducting ground states.

• OSTI ID: 44611
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 16 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANALYTICAL SOLUTION
GROUND STATES
HUBBARD MODEL
ONE-DIMENSIONAL CALCULATIONS
PHASE DIAGRAMS
STABILITY
SUPERCONDUCTIVITY
SYMMETRY GROUPS