Observation of excited (bi-)exciton and multi-exciton features in locally homogeneous quantum dots

✍ Scribed by Frank P.J de Groote; Twan van Lippen; Jos E.M Haverkort; Richard Nötzel; Joachim H Wolter

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 110 KB
• Volume: 17
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(02)00715-4

✦ Synopsis

We investigate micro-photoluminescence spectra of arrays of locally homogeneous quantum dots (QDs). Our spectra indicate that the QDs exhibit excellent homogeneity in size on a length scale extending up to several microns. Using a Hartree-Fock based calculation including Coulomb and exchange energies, the observed spectra can be assigned to excitonic and multi-excitonic transitions, including excited exciton and excited bi-exciton transitions. We explain the strong excited-state recombinations due to the existence of a phonon bottleneck in our strain-free QD-arrays.