Dephasing of Heavy–Light Hole Quantum Beats by Coulomb Quantum Kinetics

✍ Scribed by B. Mieck; H. Haug

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 247 KB
• Volume: 213
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/(sici)1521-3951(199906)213:2<397::aid-pssb397>3.0.co;2-x

✦ Synopsis

We investigate the dephasing of quantum beats between the continuum states of the heavy±light hole valence bands in GaAs, excited by a coherent femtosecond laser pulse. A Coulomb quantum kinetic calculation is used to determine the quantum beats for a coherent differential transmission experiment. Our theory is based on the full two-time-dependent RPA-screened Coulomb potential which is calculated self-consistently and evolves from a bare potential to the well-known dynamically screened RPA potential for long times. Our calculation shows that strongly damped quantum beats between the continuum states of the heavy±light hole valence bands still persist at higher excitation densities of 10 17 to 10 18 cm À3 .