| Autor: |
Machida, S, Takakuma, T, Fujiwara, kenzo |
| Jazyk: |
angličtina |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
Physica E: Low-dimensional Systems and Nanostructures. 33(1):196-200 |
| Popis: |
Anti-Stokes photoluminescence (AS-PL) has been investigated in a step-gradedInx(Al0.17Ga0.83)1-xAs/Al0.17Ga0.83As quantum well (QW) system consisting of five QWs with different xvalues. When a low-energy heavy-hole (1s) exciton state in a particular well is resonantly photoexcited, thehigh-energy heavy-hole (1s) exciton in the nearest-neighbor well shows a stronger AS-PL intensity than otherQWs beyond the nearest-neighbor QW. The AS-PL intensity of (1s) excitons observed in each well shows adrastic position dependence on where carriers are resonantly photoexcited, indicating energy transferprocesses with a spatial position dependence. These results mean that the up-conversion phenomenaresponsible for generating high-energy carriers can be influenced by transfer and capture processes into thehigh-energy exciton state in addition to nonlinear excitation mechanisms. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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