https://doi.org/10.1007/s100510050009
Electronic properties of CuO2-planes: A DMFT study
Institut für Theoretische Physik I, Universität
Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany
Corresponding author: a markus.zoelfl@rphs1.physik.uni-regensburg.de
Received:
21
September
1998
Revised:
8
June
1999
Published online: 15 January 2000
We study one-particle spectra and the electronic band-structure
of a CuO2-plane within the three-band Hubbard model.
The Dynamical Mean-Field Theory (DMFT) is used to solve the many
particle problem. The calculations show that the optical gap
is given by excitations from the lower
Hubbard band into the so called Zhang-Rice singlet band.
The optical gap turns out to be considerably
smaller than the bare charge transfer energy Δ
(
) for a typical set of parameters,
which is in agreement with experiment. We also investigate the
dependence of the shape of the Fermi surface on the different hopping
parameters tCuO and tOO. A value tOO/tCuO>0 leads to a Fermi surface surrounding the M point.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
