Coherent exciton-continuum coupling in semiconductors

Author

Cundiff, S.T. ; Koch, Martin ; Knox, Wayne H. ; Shah, J. ; Stolz, Wolfgang

Author_Institution

AT&T Bell Labs., Holmdel, NJ, USA

fYear

1996

fDate

7-7 June 1996

Firstpage

105

Lastpage

106

Abstract

Summary form only given. Despite recent effort, there are aspects of the transient four-wave-mixing (TFWM) response of semiconductors that remain puzzling. By performing partially nondegenerate TFWM (PND-TFWM) we show that for broadband excitation, the signal emitted at the 1 s exciton is dominated by contributions that correspond to excitation of higher states by the first pulse. The interference of these contributions results in the rapid decay of the excitonic signal. Our results demonstrate that, because TFWM is inherently a many-particle phenomenon, the many-body interactions always couple the excitonic transitions.

Keywords

excitons; high-speed optical techniques; many-body problems; multiwave mixing; optical couplers; semiconductor materials; statistical mechanics; transients; broadband excitation; coherent exciton-continuum coupling; exciton; excitonic signal decay; excitonic transitions; higher states; many-body interactions; many-particle phenomenon; partially nondegenerate TFWM; semiconductors; transient four-wave-mixing; Birefringence; Delay; Etching; Excitons; Frequency; Interference; Laser excitation; Optical polarization; Signal resolution; Stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics and Laser Science Conference, 1996. QELS '96., Summaries of Papers Presented at the

Conference_Location

Anaheim, CA, USA

Print_ISBN

1-55752-444-0

Type

conf

Filename

865628