| Autor: |
Galbraith, I., Chari, R., Pellegrini, S., Phillips, P. J., Dent, C. J., van der Meer, A. F. G., Clarke, D. G., Kar, A. K., Buller, G. S., Pidgeon, C. R., Murdin, B. N., Allam, J., Strasser, G. |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Physical Review B, 71 |
| Popis: |
Measurements of the THz absorption and the time-resolved photoluminescence have been performed on the same GaAs quantum well sample. The strength of the absorption at the internal 1s-2p exciton transition frequency is used as a measure of the density of excitons in the sample. When the interband pump laser is resonant with the 1s exciton frequency, induced absorption at the s-2p frequency is clearly seen. If the same density of carriers is created pumping in the continuum, no significant 1s-2p absorption is seen in a time window of 450 ps. Complementary time-resolved photoluminescence experiments, detecting the emission at the exciton energy under the same pump conditions, show the PL intensity in resonant and nonresonant cases to be similar. The counter-intuitive existence of luminescence at the exciton energy simultaneously with the absence of the s-2p absorption is consistent with the recent theoretical predictions of Kira et al., Phys. Rev. Lett. 81, 3263 (1998). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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