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Wühr, J. ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Nonperturbative Coulomb correlations generated by simultaneous excitation of excitonic and band-to-band continuum transitions.
In: Physical Review B.
Bd. 70
(2004)
Heft 15
.
- 155203.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.70.155203
Abstract
We investigate theoretically the nonlinear optical response of a semiconductor for excitation conditions where simultaneously all kinds of correlated two-pair transitions contribute to the dynamics. This includes transitions to biexcitons, exciton-exciton scattering states, two free electron-hole pairs as well as two-pair states involving an exciton and a free electron-hole pair. For certain excitation conditions two-pair correlations give rise to a complex line shape of four-wave-mixing spectra with an emission spread over the whole range between the exciton line and the band-edge. Even a strong suppression of the signal at the exciton line can be achieved while the emission is still concentrated between the exciton and the band-edge. The dependence of these features on the excitation conditions and on the strength of the Coulomb interaction is discussed. Comparing a nonperturbative treatment of the Coulomb interaction with the Born approximation and the mean-field theory clearly reveals the importance of nonperturbative Coulomb correlations even for excitations involving the continuum of free electron-hole pairs.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | two-pair correlations; exciton-exciton continuum correlations; biexcitons; dynamics controlled trauncation; non-linear optics; ultrafast dynamics; free electron hole pairs; four-wave mixing; Coulomb correlations; many-body quantum correlations |
| 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: | 23 Okt 2017 09:52 |
| Letzte Änderung: | 02 Aug 2023 12:54 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/40110 |