Heinz Schmid, Hans Biebuyck, et al.
Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Paper
Excitations in a nearly half-filled Hubbard model with U=
Abstract
It is shown that, even near half filling, the elementary excitations of the large-U Hubbard model form wide bands of width t, the intersite hopping integral, and that the slave-boson-based mean-field approximation is qualitatively wrong in the relevant limit. This large-U limit has no Kondo-type divergences. © 1989 The American Physical Society.
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