Observation of coherent biexcitons in ZnO/ZnMgO multiple quantum wells at room temperature
Date
2006-11-01
Authors
Davis, Jeffrey A.
Van Dao, Lap
Wen, Xiaoming
Hannaford, Peter
Coleman, Victoria A
Jagadish, C.
Koike, K.
Sasa, S.
Inoue, M.
Yano, M.
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American Institute of Physics (AIP)
Abstract
We have studied ZnO∕ZnMgO 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 ZnO∕ZnMgOquantum wells at room temperature. Dephasing times of the order of 100fs for the biexcitons are measured.
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Keywords: Coherent light; Excitons; Four wave mixing; Photons; Semiconductor quantum wells; Thermal effects; Transients; Biexcitons; Interpulse delays; Room temperature; Zinc oxide
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Applied Physics Letters
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Journal article
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