Title :
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
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;
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
