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Solid State Communications

Theory for the transfer of weight in the electronic spectral density of strongly correlated systems

C. Lehner, Gunnar Baumgärtel, Jörg Schmalian, Karl H. Bennemann

Published Feb 1, 1994• 3 citations
Publisher
DOI
10.1016/0038-1098(94)90584-3

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We study the spectral weight transfer and the chemical potential shift in strongly correlated electron systems caused by carrier doping by applying the dynamical mean-field theory to a two-band Hubbard model. The parameters of the model are chosen so that the undoped system is a charge-transfer-type insulator. We find that in the insulating phase there are finite intensities corresponding to local singlet states formed by hybridized d and p electrons, and that, on doping a part of them, turn into itinerant states. The results are discussed in the light of experimental and theoretical results for high-Tc{\mathit{T}}_{\mathit{c}}Tc​ cuprates. \textcopyright{} 1996 The American Physical Society.