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

Title data

Haase, B. ; Neukirch, U. ; Gutowski, J. ; Bartels, G. ; Stahl, Arne ; Axt, Vollrath M. ; Nürnberger, J. ; Faschinger, W.:
Manifestation of exciton-amplitude fluctuations in the transient polarization state of four-wave-mixing signals.
In: Physical Review B. Vol. 59 (1999) Issue 12, Rapid Communication . - 7805(R)-7808(R).
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.59.R7805

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum wells; excitons; dynamics controlled truncation; Semiconductors; laser excitation; ultrafast dynamics; non-linear optics; biexcitons; polarization dependence; exciton-exciton continuum; higher order correlations
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: 17 Oct 2017 10:53
Last Modified: 17 Oct 2017 10:57
URI: https://eref.uni-bayreuth.de/id/eprint/40041