Magneto-optical study on exciton screening in AlxGa1-xAs/InyGa1-yAs quantum wells
We have studied exciton unbinding in empty and p-doped quantum wells, using magnetophotoluminescence excitation measurements. The use of p-type quantum wells allows us to discriminate unambiguously between exciton bleaching by Coulomb screening and by the Pauli exclusion principle. We found that the...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 August 1997
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| In: |
Physical review. B, Condensed matter and materials physics
Year: 1997, Volume: 56, Issue: 8, Pages: 4853-4862 |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.56.4853 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevB.56.4853 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.56.4853 
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| Author Notes: | M. Kemerink and P.M. Koenraad, P.C.M. Christianen, R. van Schaijk, J.C. Maan, J.H. Wolter |
| Summary: | We have studied exciton unbinding in empty and p-doped quantum wells, using magnetophotoluminescence excitation measurements. The use of p-type quantum wells allows us to discriminate unambiguously between exciton bleaching by Coulomb screening and by the Pauli exclusion principle. We found that the ground-state heavy-hole exciton, which experiences both effects, is unbound at hole densities in the range (6-9)×1015m−2. In contrast, the ground-state light-hole and first excited heavy-hole excitons, which are only screened by the Coulomb interaction, still have a finite binding energy at these densities. However, for both bands, its value is far below what is found in an undoped well. Furthermore, we found a strong indication that, in p-doped wells, the excitons of excited subbands are less efficiently screened than those of the light-hole ground state, due to the lesser overlap of the screening ground-state heavy holes with the excited subbands than with the ground-state light holes. |
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| Item Description: | Gesehen am 10.12.2019 Im Titel sind "x", "1-x", "y" und "1-y" tiefgestellt |
| Physical Description: | Online Resource |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.56.4853 |