Carrier density effects on the exciton binding energy in double quantum well systems

✍ Scribed by A. Hernández-Cabrera

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 110 KB
• Volume: 4
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(98)00240-9

✦ Synopsis

Carrier density e ects on the dynamics of an electrically pumped exciton, created by hole-assisted, electron resonant tunneling in an asymmetric coupled quantum well system, has been studied self-consistently. Calculations show that, ÿrst, the binding energy and the oscillation period decrease with increasing carrier concentration, the charge oscillation being nonperiodic for sheet densities greater than 5 ×10 10 cm -2 (for the proposed sample). Second, a transition from excitonic to electron-hole plasma states occurs at densities ranging from 5 ×10 8 to 2:5 ×10 10 cm -2 . As a consequence, the present work shows that many-body e ects are necessary to obtain accurate results in calculating tunneling electromagnetic radiation.