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Nonperturbative Coulomb correlations generated by simultaneous excitation of excitonic and band-to-band continuum transitions

Titelangaben

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.

Weitere Angaben

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