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