Biexcitons and their dephasing processes in ZnO

Autor:	Kouji Hazu, Satoru Adachi, Gene Cantwell, Donald C. Reynolds, Takayuki Sota, Cole W. Litton, Sigefusa Chichibu
Rok vydání:	2005
Předmět:	Condensed Matter::Quantum Gases Condensed Matter::Materials Science Condensed matter physics Condensed Matter::Other Chemistry Exciton Dephasing Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Polarization (waves) Biexciton
Zdroj:	physica status solidi (c). 2:890-895
ISSN:	1610-1634
DOI:	10.1002/pssc.200460332
Popis:	We have investigated free excitons and biexcitons of bulk ZnO by time-integrated and spectrally-resolved four-wave mixing. The polarization- and wave-vector-dependent FWM signals for A and B excitons demonstrate clearly that the valence-band ordering is A–Γ9, B–Γ7, and C–Γ7. Next, we gave qualitative explanation of the FWM signals induced by excitons and biexcitons in ZnO. For negative delay times, bound and unbound AB-biexcitons (A exciton-B exciton correlation), which have been considered to play a minor role in GaAs heterostructures, was found to play an important role and give a significant qualitative impact to the optical response of ZnO. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze:	OpenAIRE
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