Surface properties of a heavy-fermion system: An exact many-body solution to a periodic-cluster Hubbard model
An exact solution of an eight-site crystal model with periodic boundary conditions, a /001/ thin film with face-centered-cubic crystal structure, is presented for the case of a heavy-fermion system. The object is to study modifications of the many-body electronic structure in the presence of surfaces. The model consists of (a) a single, fully symmetric orbital per site, with nearest-neighbor and second-nearest-neighbor hopping; (b) an infinite Coulomb repulsion between electrons on the same site; (c) antiferromagnetic superexchange interactions; and (d) a nearly half-filled band ((7/8 electron per site). Two structures are investigated: a two-layer and a four-layer fcc slab. The nature of the change from bulk to surface is studied by introducing a variable coupling between periodically extended slabs. The many-body spectrum, the one-electron occupancy, and the change in properties from bulk to surface are obtained and discussed.
- Research Organization:
- Department of Physics, University of California, Berkeley, California 94720
- OSTI ID:
- 6858520
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:18; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BOUNDARY CONDITIONS
COULOMB FIELD
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC FIELDS
ELECTRONIC STRUCTURE
EXCHANGE INTERACTIONS
FCC LATTICES
FERMIONS
HAMILTONIANS
INTERACTIONS
LAYERS
MAGNETISM
MANY-BODY PROBLEM
MATHEMATICAL OPERATORS
QUANTUM OPERATORS
SOLID CLUSTERS
SURFACES