Article ID Journal Published Year Pages File Type
9586173 Journal of Luminescence 2005 4 Pages PDF
Abstract
We propose a non-resonant two-photon absorption as a method to create a high-density gas of para-excitons uniformly distributed in a whole volume of a crystal. In non-linear pump-probe experiments we measure changes of the IR absorption induced by the presence of optically excited para-excitons. This way, we directly determine the energy of the para-excitonic 1s→2p transition at 129 meV. On the basis of temporal evolution of the induced absorption signal we find the lifetime of the para-excitons to be of the order of 10 ms.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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