Coexistence of both coherent and incoherent peaks in photoemission spectra of intermediately correlated many-electron systems
| Autor: | Norikazu Tomita, Masahiro Yamazaki, Keiichiro Nasu, H. Zhao, Chang-Qin Wu |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Radiation Hubbard model Condensed matter physics Fermi level Electronic structure Electron Condensed Matter Physics Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Mott transition symbols.namesake symbols Density of states Condensed Matter::Strongly Correlated Electrons Emission spectrum Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. 136:49-56 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/j.elspec.2004.02.131 |
| Popis: | We have theoretically studied various one-, two- and three-dimensional half-filled Hubbard models from weak correlation cases to strong ones, and calculated the Lehmann’s spectra of the momentum-specified one-electron Green’s functions, as well as the total density of states (DOS), using the quantum Monte-Carlo method. In the region of intermediate correlation strength, we have found the DOS has new characteristic peaks near the Fermi level, in addition to the well-known upper and lower Hubbard-band peaks. We show these new peaks near the Fermi level comes from quasi-coherent states, while the upper and lower Hubbard-band peaks comes from strongly incoherent ones. This multi-peaked structure, appearing only in the intermediate region, is shown to be quite insensitive to the dimensionality. Finally, we compare our results with the static single impurity model, and give a rough and intuitive explanation for the origin of this newly obtained multi-peaked structure. Our results also qualitatively agree with the recent photoemission experiments on CaVO 3 and SrVO 3 crystals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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