Long-lived two-dimensional triplet magnetoexcitons in a Hall insulator
| العنوان: | Long-lived two-dimensional triplet magnetoexcitons in a Hall insulator |
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| المؤلفون: | Vladislav B. Timofeev, A. V. Gorbunov, L. V. Kulik, A. S. Zhuravlev, I. V. Kukushkin |
| المصدر: | Journal of Experimental and Theoretical Physics. 122:525-530 |
| بيانات النشر: | Pleiades Publishing Ltd, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Physics, Condensed matter physics, Exciton, Relaxation (NMR), General Physics and Astronomy, Electron, Landau quantization, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 01 natural sciences, Light scattering, 010305 fluids & plasmas, Photoexcitation, Condensed Matter::Materials Science, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Spin (physics) |
| الوصف: | An experimental technique is developed to perform photoexcitation of an ensemble of translationinvariant triplet excitons, to manipulate this ensemble, and to detect the properties of its components. In particular, the influence of temperature on the radiationless decay during the relaxation of an exciton spin into the ground state of a Hall insulator at a filling factor ν = 2 is studied. The generation of photoexcited electrons and holes is controlled using photoinduced resonance reflection spectra, which makes it possible to estimate the density of light-generated electron–hole pairs and to independently control the self-consistent generation of electrons at the first Landau level and holes (vacancies) at the ground (zero) cyclotron electronic level. The existence of triplet excitons is established from inelastic light scattering spectra, which are used to determine the singlet–triplet exciton splitting. The lifetimes of triplet excitons, which are closely related to the relaxation time of an electron spin, are extremely long: they reach 100 μs in perfect GaAs/AlGaAs heterostructures with a high mobility of two-dimensional electrons at low temperatures. These long spin relaxation times are qualitatively explained, and the expected collective behavior of high-density triplet magnetoexcitons at sufficiently low temperatures, which is related to their Bose nature, is discussed. |
| تدمد: | 1090-6509 1063-7761 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::27f1e8e2c44bd83ba4cb6da1871265e4 https://doi.org/10.1134/s1063776116030080 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........27f1e8e2c44bd83ba4cb6da1871265e4 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 10906509 10637761 |
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