Advertisement

Electronic States and Geometrical Structures of Hubbard Clusters with an Impurity

  • N. L. Sharma

Abstract

The relative stability and electronic excitation spectrum of three, four, and five site clusters is studied in the context of Hubbard model. Electron correlation is found to decrease the cohesive energy appreciably in the half-filled case. Planar geometries with a lower symmetry (pure cluster) or a large number of impurity bonds (impurity clusters) are found to be relatively stable. Noninteracting ground state is found to differ from the single particle ground state obtained by filling single particle states using the Pauli principle.

Keywords

Ground State Energy Hubbard Model Cohesive Energy Single Particle State Pauli Principle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    W.D. Knight, K. Clemenger, W.A. deHeer, W.A. Saunders, M.V. Chou, and M.L. Cohen, Phys. Rev. Letts. 52, 2141 (1984).ADSCrossRefMATHGoogle Scholar
  2. 2.
    A. Hermann, E. Schumacher, and L. Woste, J. Chem. Phys. 68., 2327 (1978)ADSCrossRefGoogle Scholar
  3. 3.
    B.K. Rao, S.N. Khanna, and P. Jena, Chem. Phys. Letts. 121, 202 (1985)ADSCrossRefGoogle Scholar
  4. 4.
    E.H. Lieb and F.Y. Wu, Phys. Rev. Letts. 20, 1445 (1968)ADSCrossRefGoogle Scholar
  5. 5.
    L.M. Falicov and R.H. Victora, Phys. Rev. B30, 1695 (1984).ADSGoogle Scholar
  6. 6.
    Y. Ishii and S. Sugano, J. Phys. Soc. Jpn. 53, 3895 (1984).ADSCrossRefGoogle Scholar
  7. 7.
    J. Callaway, D.P. Chen, and R. Tang, Private Commucation.Google Scholar
  8. 8.
    B.K. Rao, S.N. Khanna, P. Jena, Z. Phys. D3, 219 (1986)ADSGoogle Scholar
  9. 9.
    A.L. Fetter and J.D. Walecka in “Quantum Theory of Many- Particle Systems ”(McGraw-Hill, New York, 1971), p.61.Google Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • N. L. Sharma
    • 1
  1. 1.Physics DepartmentVirginia Commonwealth UniversityRichmondUSA

Personalised recommendations