The specifics of radiative annihilation of self-trapped excitons in a KI–Tl crystal under low-temperature deformation
| Autor: | Nurgul Zhanturina, A. A. Barmina, Z. Aimaganbetova, Sh. Zh. Sagymbaeva, L. Myasnikova, K. Sh. Shunkeyev, D. M. Sergeyev |
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| Rok vydání: | 2016 |
| Předmět: |
Condensed Matter::Quantum Gases
Annihilation Materials science Physics and Astronomy (miscellaneous) Mean free path Exciton General Physics and Astronomy Luminescence spectra 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 0103 physical sciences Compressibility Radiative transfer Rectangular potential barrier Atomic physics 010306 general physics 0210 nano-technology Luminescence |
| Zdroj: | Low Temperature Physics. 42:580-583 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.4960008 |
| Popis: | The effect of low-temperature uniaxial deformation on the self-trapping-limited mean free path of excitons in a KI–Tl crystal was revealed from x-ray luminescence spectra. The analysis of the dependence of the intensity ratio of the Tl-center emission (2.85 eV) and the luminescence of self-trapped excitons (π-component; 3.3 eV) on the extent of low-temperature deformation showed that in the KI–Tl crystal (3 × 10−3 mol. %) the self-trapping-limited mean free path of excitons is comparable with the distance between Tl atoms (20–27)a under a deformation e = 2%. As the compression increases to e ≥ 2%–5%, the mean free path drops to (27-5.35)a. The results of modeling based on the continuum approximation showed that with increasing temperature and the degree of low-temperature deformation the height of the potential barrier for the exciton self-trapping drops, which is consistent with the reduction of the mean free path of excitons in the KI–Tl crystal. |
| Databáze: | OpenAIRE |
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