Study of ortho-to-paraexciton conversion in Cu$_2$O by excitonic Lyman spectroscopy

Details Study of ortho-to-paraexciton conversion in Cu$_2$O by excitonic Lyman spectroscopy Study of ortho-to-paraexciton conversion in Cu$_2$O by excitonic Lyman spectroscopy

2004-08-27

arxiv.org/abs/cond-mat/0408605v2

Phys. Rev. Lett. 94 (2005) 016403

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.94.016403

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 Cu$_2$O is discussed.

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