title: Study of orthoexciton-to-paraexciton conversion in Cu(2)O by excitonic Lyman spectroscopy.
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.
authors.affiliation: 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.
authors.forename: M
authors.initials: M
authors.lastname: Kubouchi
authors.forename: K
authors.initials: K
authors.lastname: Yoshioka
authors.forename: R
authors.initials: R
authors.lastname: Shimano
authors.forename: A
authors.initials: A
authors.lastname: Mysyrowicz
authors.forename: M
authors.initials: M
authors.lastname: Kuwata-Gonokami