Literatur vom gleichen Autor/der gleichen Autor*in
plus bei Google Scholar

Bibliografische Daten exportieren
 

Manifestation of exciton-amplitude fluctuations in the transient polarization state of four-wave-mixing signals

Titelangaben

Haase, B. ; Neukirch, U. ; Gutowski, Jürgen ; Bartels, G. ; Stahl, Arne ; Axt, Vollrath Martin ; Nürnberger, J. ; Faschinger, W.:
Manifestation of exciton-amplitude fluctuations in the transient polarization state of four-wave-mixing signals.
In: Physical Review B. Bd. 59 (1999) Heft 12 . - 7805(R).
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.59.R7805

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

The polarization state of the diffracted beam in degenerate four-wave mixing is experimentally and theoretically investigated, resolved in the time as well as in the frequency domain. The use of thin ZnSe quantum wells having large (bi)exciton binding energies makes it possible to restrict the optical excitation by broadband 110 fs pulses to quasi-two-dimensional heavy-hole excitons and biexcitons only. Despite these most simple experimental conditions, an extremely complex dynamics of the polarization state is observed when one circularly and one linearly polarized beam are used for excitation. The detailed behavior sensitively depends on the excitation density, showing the importance of nonlinearities of higher than third order even at exciton densities less than 0.01 times the Mott density. A comparison of the experimental data with theoretical results obtained by a microscopic density-matrix approach yields very close agreement. It turns out that a dynamical object describing fluctuations of the exciton amplitude has to be included in the theory in addition to biexcitonic contributions and correlated parts of the exciton-exciton scattering continuum.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: quantum wells; excitons; dynamics controlled truncation; Semiconductors; laser excitation; ultrafast dynamics; non-linear optics; biexcitons; polarization dependence; exciton-exciton continuum; higher order 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: 17 Okt 2017 10:53
Letzte Änderung: 02 Aug 2023 12:33
URI: https://eref.uni-bayreuth.de/id/eprint/40041