## Title data

Victor, K. ; Axt, Vollrath M. ; 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.
Vol. 99
(1995)
Issue 2
.
- pp. 197-205.

ISSN 1431-584X

DOI: https://doi.org/10.1007/s002570050028

## Abstract in another language

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.

## Further data

Item Type: | Article in a journal |
---|---|

Refereed: | Yes |

Keywords: | density matrix theory; semiconductors; non-linear optics; ultrafast dynamics |

Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III |

Result of work at the UBT: | No |

DDC Subjects: | 500 Science > 530 Physics |

Date Deposited: | 16 Oct 2017 10:00 |

Last Modified: | 16 Oct 2017 10:00 |

URI: | https://eref.uni-bayreuth.de/id/eprint/40011 |