title: Probing Bose-Einstein condensation of excitons with electromagnetic radiation.
abstract: We examine the absorption spectrum of electromagnetic radiation from excitons, where an exciton in the 1s state absorbs a photon and makes a transition to the 2p state. We demonstrate that the absorption spectrum depends strongly on the quantum degeneracy of the exciton gas, and that it will generally manifest many-body effects. Based on our results we propose that absorption of infrared radiation could resolve recent contradictory experimental results on excitons in Cu(2)O.
authors.affiliation: NORDITA, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark.
authors.forename: K
authors.initials: K
authors.lastname: Johnsen
authors.forename: G M
authors.initials: GM
authors.lastname: Kavoulakis