Validity of the rigid-band picture for the [ital t]-[ital J] model

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.3350· OSTI ID:6669448

Eder, R; Ohta, Y; Shimozato, T ^[1]

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1. Department of Applied Physics, Nagoya University, Nagoya 464-01 (Japan)

We present an exact diagonalization study of the doping dependence of the single-particle Green's function in 16-, 18-, and 20-site clusters of the [ital t]-[ital J] model. We find evidence for the validity of the rigid-band picture starting from the half-filled case: upon doping, the topmost states of the quasiparticle band observed in the photoemission spectrum at half-filling cross the chemical potential and reappear as the lowermost states of the inverse photoemission spectrum. Features in the inverse photoemission spectra, which are inconsistent with the rigid-band picture, are shown to originate from the nontrivial point-group symmetry of the ground state with two holes, which enforces different selection rules than at half-filling. Deviations from rigid-band behavior which lead to the formation of a large Fermi surface in the momentum distribution are found to occur at energies far from the chemical potential. A Luttinger Fermi surface and a nearest-neighbor hopping band do not exist.

• OSTI ID: 6669448
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:5; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ANTIFERROMAGNETISM
BAND THEORY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EMISSION
ENERGY LEVELS
FERMI LEVEL
GROUND STATES
HIGH-TC SUPERCONDUCTORS
HOLES
MAGNETISM
PHOTOEMISSION
PHYSICAL PROPERTIES
SECONDARY EMISSION
SUPERCONDUCTIVITY
SUPERCONDUCTORS