Exciton bleaching in p-type single and double quantum wells: The effects of subband occupation and wave function overlap
1997 (English)In: Physica status solidi. A, Applied research, ISSN 0031-8965, E-ISSN 1521-396X, Vol. 164, no 1, 73-76 p.Article in journal (Refereed) Published
We have studied exciton unbinding in empty and p-doped single and double quantum wells, using magneto-photoluminescence excitation measurements. The use of p-type heterostructures allows to discriminate unambiguously between exciton bleaching by Coulomb screening and by the Pauli exclusion principle. The groundstate heavy-hole exciton, which experiences both effects, is unbound at hole densities in the range (6 to 11) x 10(15) m(-2). In contrast, the groundstate light-hole and first excited heavy-hole excitons: which only experience Coulomb screening, still have a finite binding energy at these densities. We found that the excitons of excited subbands are far less efficiently screened than those of the light-hole groundstate, due to the lesser overlap of the screening groundstate heavy holes with the excited subbands than with the groundstate light holes.
Place, publisher, year, edition, pages
Academic Verlag GMBH , 1997. Vol. 164, no 1, 73-76 p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:liu:diva-116064DOI: 10.1002/1521-396X(199711)164:1<73::AID-PSSA73>3.0.CO;2-DISI: 000071319400015OAI: oai:DiVA.org:liu-116064DiVA: diva2:813300
5th International Meeting on Optics of Excitons in Confined Systems (OECS 5)