| Autor: |
Timofeev, V.B., Filin, A.I., Tartakovskii, A.I., Birkedal, D., Hvam, J.M. |
| Zdroj: |
Physica Status Solidi (A) - Applications and Materials Science; November 1997, Vol. 164 Issue: 1 p595-599, 5p |
| Abstrakt: |
The formation of spatially indirect (interwell) excitons in superlattices (SLs) with different barrier widths (different tunneling coupling) is experimentally investigated in a strong enough magnetic field with the use of photoluminescence (PL), photoluminescence excitation (PLE), reflectance spectra and time-resolved technique. The experimental conditions for the observation of interwell excitons in SLs without externally breaking inversion symmetry are identified and the distinct excitonic state is found to be located between 1s-exciton and the onset of the miniband absorption. Magnetic field, perpendicular to the layers, strongly modifies the interwell and intrawell excitonic states and transforms the system to the weak coupling regime. The effect of interwell exciton conversion into intrawell one due to excitonexciton collisions has been observed at a high excitation regime and confirmed by time-resolved spectroscopy experiments under pulsed picosecond excitation. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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