Off-diagonal interactions, Hund's rules, and pair binding in C[sub 60]
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080 (United States)
We have studied the effect of including nearest-neighbor electron-electron interactions, in particular the off-diagonal (non-density-density) terms, on the spectra of truncated tetrahedral and icosahedral Hubbard molecules, focusing on the relevance of these systems to the physics of doped C[sub 60]. Our perturbation theoretic and exact diagonalization results agree with previous work in that the density-density term suppresses pair binding. However, we find that for the parameter values of interest for C[sub 60], the off-diagonal terms [ital enhance] pair binding, though not enough to offset the suppression due to the density-density term. We also find that the critical interaction strengths for the Hund's rules violating level crossings in C[sub 60][sup [minus]2], C[sub 60][sup [minus]3], and C[sub 60][sup [minus]4] are quite insensitive to the inclusion of these additional interactions.
- OSTI ID:
- 6400960
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 51:9; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
FULLERENES
PAIRING INTERACTIONS
AUFBAU PRINCIPLE
BINDING ENERGY
ELECTRON-ELECTRON INTERACTIONS
HUBBARD MODEL
PERTURBATION THEORY
SUPERCONDUCTIVITY
CARBON
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
NONMETALS
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
665411* - Basic Superconductivity Studies- (1992-)
360607 - Other Materials- Superconducting Properties- (1992-)