Issue |
Europhys. Lett.
Volume 47, Number 1, July 1999
|
|
---|---|---|
Page(s) | 77 - 82 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00354-1 | |
Published online | 01 September 2002 |
Theoretical description of charge excitations in low-dimensional undoped cuprates
Institut für Theoretische Physik, Technische Universität Dresden D-01062 Dresden, Germany
Received:
25
January
1999
Accepted:
20
April
1999
We investigate Cu X-ray photoemission spectra of
low-dimensional undoped cuprates within a multi-band Hubbard model,
using a cumulant projection technique. This method makes the
treatment of infinite systems possible while still allowing
for a clear interpretation of final states. Delocalization
processes and multiplet splitting are described within one
framework. The results are compared to those of exact
diagonalization calculations and to experimental spectra
of Bi2CuO4 and Sr2CuO3. For both compounds the
calculations are in good agreement with the
experiment. The charge-transfer energy Δ for Sr2CuO3
is found to be smaller than in other cuprates.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 79.60.-i – Photoemission and photoelectron spectra / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EDP Sciences, 1999
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