Study of orthoexciton-to-paraexciton conversion in Cu(2)O by excitonic Lyman spectroscopy |
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| Authors: | Kubouchi M Yoshioka K Shimano R Mysyrowicz A Kuwata-Gonokami M |
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| Institution: | Department of Applied Physics, The University of Tokyo, and Solution Oriented Research for Science and Technology (SORST), JST, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. |
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| Abstract: | Using time-resolved 1s-2p excitonic Lyman spectroscopy, we study the orthoexciton-to-paraexciton transfer, following the creation of a high density population of ultracold 1s orthoexcitons by resonant two-photon excitation with femtosecond pulses. An observed fast exciton-density dependent conversion rate is attributed to spin exchange between pairs of orthoexcitons. Implication of these results on the feasibility of Bose-Einstein condensation of paraexcitons in Cu(2)O is discussed. |
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