Multi-exciton spectroscopy on a self-assembled InGaAs/GaAs quantum dot

✍ Scribed by F. Findeis; A. Zrenner; M. Markmann; G. Böhm; G. Abstreiter

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 334 KB
• Volume: 7
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(99)00340-9

✦ Synopsis

We report about spatially resolved magneto-optical experiments on a self-assembled InGaAs quantum dot. Using electron beam lithograpy for patterning a metal shadow mask we can isolate a single dot. This allows us to study the optical response of a single dot as a function of excitation power and magnetic ÿeld. We investigate the in uence of many body interaction in the emission spectra for di erent exciton occupation numbers of the dot. The diamagnetic=orbital shift as well as Zeeman splitting in a magnetic ÿeld can be fully resolved and are used to identify the observed emission lines. Further we report on absorption properties of the quantum dot as a function of magnetic ÿeld. We analyse in detail the phonon-assisted absorption process connected with the GaAs LO-phonon 36 meV above the single-exciton ground state.