Journal of Superconductivity

, Volume 7, Issue 3, pp 581–583 | Cite as

Optical absorption in the two-dimensional two-band model

  • A. Mishima
XVI. High Tc Oxides Theory


The optical properties are studied within the two-dimensional two-band model with the antiferromagnetic exchange interaction between nearest-neighbord andp spins in the Cu-O sheet. The optical-absorption spectra are computed within the mean-field theory with the periodic boundary condition. An insulating gap of about 1.7 eV appears for nondoping. A Drude peak appears for a singlep hole. The Drude peak and the in-gap state appear for twop holes. The intensity of the charge-transfer band decreases, while those of the Drude peak and the in-gap state increase with doping. It turns out that the strong Coulomb repulsion and the\(d_{x^2 - y^2 } \) orbital are important such as thep x orp y orbital in the electronic properties of high-T c copper oxides.

Key words

High-Tc superconductivity optical absorption in-gap state two-dimensional systems two-band model 


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  1. 1.
    G. A. Thomas, J. Orenstein, D. H. Rapkine, M. Capizzi, A. J. Millis, R. N. Bhatt, L. F. Schneemeyer, and J. V. Waszczak,Phys. Rev. Lett. 61, 1313 (1988).Google Scholar
  2. 2.
    R. T. Collins, Z. Schlesinger, F. Holtzberg, P. Chandhari, and C. Feild,Phys. Rev. B 39, 6571 (1989).Google Scholar
  3. 3.
    S. Uchida, T. Ido, H. Takagi, T. Arima, Y. Tokura, and S. Tajima,Phys. Rev. B 43, 7942 (1991).Google Scholar
  4. 4.
    T. M. Rice and F. C. Zhang,Phys. Rev. B 39, 815 (1989).Google Scholar
  5. 5.
    E. Dagotto, A. Moreo, F. Ortolani, J. Riera, and D. J. Scalapino,Phys. Rev. B 45, 10107 (1992).Google Scholar
  6. 6.
    J. E. Hirsch,Physica C 201, 347 (1992).Google Scholar
  7. 7.
    A. Mishima,Physica C 185–189, 1577 (1991).Google Scholar
  8. 8.
    A. Mishima, inElectronic Properties and Mechanisms of High-T c Superconductors, T. Oguchi, K. Kadowaki, and T. Sasaki, eds. Elsevier, Amsterdam, 1992, pp. 357–359.Google Scholar
  9. 9.
    A. Mishima,Physica B (1994), in press.Google Scholar
  10. 10.
    M. S. Hybertsen, M. Schlüter, N. E. Christensen,Phys. Rev. B 39, 9028 (1989).Google Scholar

Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • A. Mishima
    • 1
  1. 1.Kanazawa Institute of TechnologyIshikawaJapan

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