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Title

Observation of coherent biexcitons in ZnO/ZnMgO multiple quantum wells at room temperature

Author(s)

Davis, Jeffrey A.;  Dao, Lap Van;  Wen, Xiaoming;  Hannaford, Peter;  Coleman, Victoria A.;  Tan, H. Hoe;  Jagadish, Chennupati;  Koike, Katsuaki;  Sasa, Shigehiko;  Inoue, Masataka;  Yano, Mitsuaki

Abstract

We have studied ZnOZnMgO multiple quantum wells by spectrally resolved transient four-wave mixing with both one- and two-color excitations. The presence of an extended signal at negative interpulse delays in the two-color experiment is attributed to the two-photon coherence resulting from the generation of biexcitons. This technique provides a means to observe a transient four-wave mixing from biexcitons in the absence of any other signal, and thereby provides the first clear evidence that biexcitons are present in narrow ZnOZnMgO quantum wells at room temperature. Dephasing times of the order of 100 fs for the biexcitons are measured.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy

Source

Applied Physics Letters, Vol. 89, no. 18 (2006)

Publication year

2006

Keyword(s)

Zinc compounds;  Magnesium compounds;  II-VI semiconductors;  Wide band gap semiconductors;  Semiconductor quantum wells;  Biexcitons;  Multiwave mixing;  Two-photon processes;  Photoexcitation

Publisher

American Institute of Physics

ISSN

0003-6951

Publisher URL

http://dx.doi.org/10.1063/1.2372747

Copyright

Copyright © 2006 American Institute of Physics. Reproduced in accordance with the copyright policy of the publisher.

Full text

Peer reviewed