Abstract : A high density of cold 1s orthoexcitons was created in Cu2O using two counterpropagating high-power femtosecond infrared (IR) laser beams tuned to half the 1s exciton resonance energy. The initial 1s exciton gas density was estimated to reach up to 1020 cm - 3. The resulting differential absorption spectrum revealed a pronounced screening of the yellow np absorption lines, up to complete disappearance of the 2p exciton for the highest pump intensity. On the other hand, no change in the n = 1 phonon-assisted absorption continuum was detected, showing that the Mott condition for dissociation into a two-component plasma was not reached for the n = 1 excitons.
https://hal-polytechnique.archives-ouvertes.fr/hal-00465590
Contributor : Aurélien Houard
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Submitted on : Friday, March 19, 2010 - 10:43:32 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM
A. Jolk, M. Jorger, C. Klingshirn, Michel Franco, Bernard Prade, et al.. Differential Transmission Spectroscopy (DTS) in Cu2O in the Presence of Cold Excitons. physica status solidi (b), Wiley, 2000, 221 (1), pp.295-299. ⟨10.1002/1521-3951(200009)221:1<295::AID-PSSB295>3.0.CO;2-A⟩. ⟨hal-00465590⟩
