Volume 37, Number 7, March I 1997
|Page(s)||471 - 476|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Charged excitons in doped extended Hubbard model systems
Laboratory of Applied and Solid State Physics, Materials Science Centre, University of Groningen - Nijenborgh 4, 9747 AG Groningen, The Netherlands
Accepted: 28 January 1997
We show that the charge transfer excitons in a Hubbard model system including nearest-neighbor Coulomb interactions effectively attain some charge in doped systems and become visible in photoelectron and inverse photoelectron spectroscopies. This shows that the description of a doped system by an extended Hubbard model differs substantially from that of a simple Hubbard model. Longer-range Coulomb interactions cause satellites in the one-electron removal and addition spectra and the appearance of spectral weight in the gap of doped systems at energies corresponding to the excitons of the undoped systems. The spectral weight of the satellites is proportional to the doping times the coordination number and therefore is strongly dependent on the dimension.
PACS: 71.10.-w – Theories and models of many electron systems / 71.35.-y – Excitons and related phenomena
© EDP Sciences, 1997
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