Features of Photoluminescence of Double Acceptors in HgTe/CdHgTe Heterostructures with Quantum Wells in a Terahertz Range
| Autor: | A. M. Kadykov, Frederic Teppe, M. A. Fadeev, D. V. Kozlov, Heinz-Wilhelm Hübers, V. V. Utochkin, Vladimir Rumyantsev, S. A. Dvoretskii, N. S. Kulikov, Nikolay N. Mikhailov, Vladimir I. Gavrilenko, S. V. Morozov |
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| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Materials science Physics and Astronomy (miscellaneous) Condensed Matter::Other Band gap Terahertz radiation Physics::Optics Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Molecular physics Acceptor Spectral line 010305 fluids & plasmas Condensed Matter::Materials Science 0103 physical sciences 010306 general physics Excitation Quantum well |
| Zdroj: | JETP Letters. 109:657-662 |
| ISSN: | 1090-6487 0021-3640 |
| Popis: | The terahertz photoluminescence spectra of HgTe/CdHgTe heterostructure with quantum wells under interband optical excitation with a power of 3 to 300 mW have been studied in the temperature range of 30–100 K. The photoluminescence spectrum includes a band corresponding to quantum energies below the width of the band gap. The position of this band does not change with increasing temperature. This property allows attributing it to the capture of holes by acceptor centers. It has been shown that these acceptor centers are singly ionized mercury vacancies, which are double acceptors. A nonmonotonic dependence of the intensity of a signal of a long-wavelength photoluminescence band on the power of an exciting source has been revealed. A short-wavelength photoluminescence band corresponding to interband transitions appears with an increase in the exciting power. It has been shown that this effect is caused by the saturation of the number of partially ionized mercury vacancies with increasing pump intensity. |
| Databáze: | OpenAIRE |
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