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Victor, K. ; Axt, Vollrath Martin ; Bartels, G. ; Stahl, Arne ; Bott, K. ; Thomas, P.:
Microscopic foundation of the phenomenological few-level approach to coherent semiconductor optics.
In: Zeitschrift für Physik B Condensed Matter.
Bd. 99
(1995)
Heft 2
.
- S. 197-205.
ISSN 1431-584X
DOI: https://doi.org/10.1007/s002570050028
Abstract
It is shown how a phenomenological few-level description of coherent semiconductor optics is related to microscopic density-matrix theory. It turns out that the few-level dynamics is not obtained by simply projecting the microscopic dynamics onto a suitable chosen set of energy eigenstates. Therefore, a new hierarchy of microscopic densities is introduced with the property that their expansion in terms of energy eigenstates yields the level dynamics. The transformation rules between the few-level variables and the traditional density matrices are established. The problem of incorporating the coupling to continua into a few-level model is discussed. A refined few-level model approximating the influence of the continua by modified couplings between the levels is presented. The modified couplings turn out to be similar in structure to phenomenologically introduced refinements like local fields. The analysis makes clear that intuitively similar approximations have a different meaning when applied in the context of a few-level model or a truncated microscopic hierarchy.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | density matrix theory; semiconductors; non-linear optics; ultrafast dynamics |
| Institutionen der Universität: | Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt Fakultäten Fakultäten > Fakultät für Mathematik, Physik und Informatik Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Eingestellt am: | 16 Okt 2017 10:00 |
| Letzte Änderung: | 07 Mär 2022 13:49 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/40011 |