Exciton lifetime in quantum well with vicinal high-density excitons

✍ Scribed by M Hirasawa; T Ishihara

• Book ID: 104429690
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 102 KB
• Volume: 7
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(99)00392-6

✦ Synopsis

Radiative lifetime of an exciton in a GaAs quantum well (QW) is controlled by high-density excitons, which restrict the exciton coherence through scattering. In order to circumvent the phase space ÿlling e ect of high-density excitons, we have prepared a QW structure in such a way that a reservoir for high-density excitons is separated from the QW. The lifetime increases (up to 30%) with the exciton density in the reservoir and saturates at 1 × 10 17 =cm 3 . The upper bound lifetime is determined by the excitonic relative motion.