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

Title data

Wühr, J. ; Axt, Vollrath M. ; Kuhn, Tilmann:
Nonperturbative Coulomb correlations generated by simultaneous excitation of excitonic and band-to-band continuum transitions.
In: Physical Review B. Vol. 70 (2004) Issue 15 . - No. 155203, 9 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.70.155203

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
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
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: 23 Oct 2017 09:52
Last Modified: 23 Oct 2017 09:52
URI: https://eref.uni-bayreuth.de/id/eprint/40110