New EL2 structural model based on the observation of two sequential photoquenching processes

P. P. Fávero () and J. M.R. Cruz

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 47, issue 3, 363-368

Abstract: The EL2 photoquenching kinetics has been studied by measuring the transmittance of a 1.05 μm laser beam as a function of time. The photoquenching curve presents two time constants that we associate to a two-stage transition through an intermediate state to the final metastable state. This was verified by measuring the temperature dependence of the transmittance with the sample prepared in a stage of partial photoquenching. Besides being also metastable, we show that the intermediate state has an optical absorption-cross section that is temperature dependent. In order to explain the existence of such a state, we propose a new structural model for the EL2 in which the motion of an arsenic atom finds two metastable positions after photoexcitation. Our model is based on a mixture of features derived from the models proposed by Chadi and Chang [1] and more recently by Fukuyama et al. [2]. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00336-7

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