Many-body photoemission theory for organic molecular crystals
| Autor: | Misa Nozaki, M. Haniuda, Kaori Niki, Satoshi Kera, Takashi Fujikawa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Radiation 010304 chemical physics Condensed matter physics Phonon Photoemission spectroscopy Non-equilibrium thermodynamics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease_cause 01 natural sciences Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Condensed Matter::Superconductivity Excited state 0103 physical sciences medicine Coulomb Physical and Theoretical Chemistry 0210 nano-technology Anisotropy Spectroscopy Ultraviolet |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. 249:147071 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/j.elspec.2021.147071 |
| Popis: | A many-body photoemission theory based on Keldysh nonequilibrium Green's functions is developed and applied to photoemission from extended states of organic molecules and their crystals, in particular excited by ultraviolet and soft X-ray radiation. In this energy region, electron-phonon interaction and radiation filed screening play some important roles. To incorporate the latter effects, we should use quantum electrodynamics (QED) approach. To discuss the electron-phonon interaction, we apply the Hedin equation including the screened Coulomb interaction mediated by the electron-phonon interaction. This theoretical framework gives us a unified picture of the UPS spectra from organic solids. Furthermore some illustrative numerical calculations are shown to discuss the relative importance of the multiple scatterings, Debye-Waller factors, the peak width of the quasi-particles, and the angular dependence of the phonon satellites. We demonstrate some specific features of ultraviolet photoemission spectroscopy (UPS) spectra from particularly anisotropic organic solids. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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