Abstract
The momentum dependence of single-particle excitations is investigated for a Cu4O8 cluster model with the periodic boundary condition by means of an exact Rumerical method. The electron removal as well as addition spectra up to a few eV exhibit considerable dispersion which can partly be interpreted by a band model. In contrast to the band model, however, an energy gap appears in the undoped ground state. At high excitation energies (≃ 10 eV), the electron8removal spectrum shows almost dispersionless features corresponding to 3d8 (Cu) and 2p4 (0) final states. The low energy excitations are further analyzed with use of the t-J model which is solved analytically on the 2×2 lattice.
On leave of absence from Institut für Theoretische Physik Universität zu Köln D-5000 Köln Fed. Rep. of Germany
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Kuramoto, Y., Schmidt, H.J. (1989). Dispersive Single-Particle Excitations in Strongly Correlated Two-Dimensional Systems. In: Fukuyama, H., Maekawa, S., Malozemoff, A.P. (eds) Strong Correlation and Superconductivity. Springer Series in Solid-State Sciences, vol 89. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83836-1_9
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