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The Exciton–Exciton Continuum and Its Contribution to Four-Wave Mixing Signals

Title data

Axt, Vollrath M. ; Victor, K. ; Kuhn, Tilmann:
The Exciton–Exciton Continuum and Its Contribution to Four-Wave Mixing Signals.
In: Physica Status Solidi B. Vol. 206 (1998) Issue 1 . - pp. 189-196.
ISSN 1521-3951
DOI: https://doi.org/10.1002/(SICI)1521-3951(199803)206:1<189::AID-PSSB189>3.0.CO;2-5

Abstract in another language

The combined influence of biexcitons and the two-exciton scattering continuum is analyzed. The analysis is based on a density matrix description of a two-band semiconductor accounting for mean-field contributions, bound biexcitons and the correlated parts of the two-exciton scattering continuum on a common footing. Consistent with the microscopic formulation, the influence of biexcitons as well as that of the two-exciton continuum is represented by a correlation kernel which is obtained from an integral equation. For a one-dimensional model four-wave mixing signals are calculated solving numerically the resulting coupled nonlinear equations for excitation conditions in the vicinity of the 1s resonance. A strong compensation between the exciton–exciton continuum and the mean-field contribution is found for all excitation conditions studied. Surprisingly, biexcitonic signatures turn out to be enhanced when continua are included in the description.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: excitons; dynamics controlled truncation; Semiconductors; laser excitation; ultrafast dynamics; non-linear optics; biexcitons; four-wave mixing; exciton-exciton continuum
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 08:22
Last Modified: 18 Oct 2017 07:37
URI: https://eref.uni-bayreuth.de/id/eprint/40025