Theoretical aspects of photoemission spectroscopy on strongly correlated electron systems
| Autor: | Keiichiro Nasu, Masahiro Yamazaki, Norikazu Tomita |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Physics
Radiation Condensed matter physics Hubbard model Fermi level Inverse photoemission spectroscopy Angle-resolved photoemission spectroscopy Weak interaction Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials symbols.namesake Condensed Matter::Superconductivity symbols Density of states Condensed Matter::Strongly Correlated Electrons Strongly correlated material Physical and Theoretical Chemistry Atomic physics Spectroscopy Spin-½ |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. :1237-1240 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/j.elspec.2005.01.001 |
| Popis: | We will clarify, from the theoretical viewpoint, how electron correlations affect the density of states (DOS) and the angle-resolved photoemission spectra (ARPES). The two-dimensional half-filled Hubbard model is employed as a prototype of the interacting electron system. In the weak interaction regime, the DOS has a multi-peak structure, which consists of a sharp one-body coherent component and a broad many-body incoherent component. Accordingly, the ARPES has a sharp coherent peak near the Fermi level. We will show that a short-range spin correlation causes the multi-peak structure in the DOS. On the other hand, as the electronic interaction increases, the DOS and APRES are dominated by the many-body incoherent component even near the Fermi level. It will be shown that the strong coupling between the collective spin excitations and photo-generated hole causes the incoherent component. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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