Kinetics of the Dephasing and the Condensation of Excitons

✍ Scribed by O.M. Schmitt; P. Gartner; L. Bányai; D.B. Tran Thoai; H. Haug

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 91 KB
• Volume: 221
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200009)221:1<221::aid-pssb221>3.0.co;2-h

✦ Synopsis

The dephasing and condensation kinetics of bosonic excitons after coherent pulse excitation is studied in the vicinity of a Bose-Einstein condensation (BEC). For a system of excitons interacting with acoustic phonons various excitation conditions are investigated. Significant qualitative changes of the polarization dephasing in the vicinity of the BEC are discussed. Furthermore the kinetics of excitons, interacting via a two particle interaction, is studied. Both the bosonic mean-field terms and the scattering terms are calculated on a microscopic level. As in the phonon-model the dephasing rate of the exciton±exciton scattering diminishes considerably in the vicinity of the BEC. All results are suited as experimentally observable signatures of an excitonic BEC.