Study of ortho-to-paraexciton conversion in Cu2O by excitonic Lyman spectroscopy
Abstract
Using time-resolved 1s-2p excitonic Lyman spectroscopy, we study the orthoexciton-to-paraexcitons 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 BEC of paraexcitons in Cu2O is discussed.
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