Positively versus negatively charged excitons: A high magnetic field study of CdTe/Cd1−xMgxTe quantum wells
| Autor: | Manfred Bayer, E. A. Zhukov, Pcm Christianen, Jacek Kossut, Alexander B. Dzyubenko, Dmitri R. Yakovlev, Jan C. Maan, G. Karczewski, G. Bartsch, Tomasz Wojtowicz, J.H. Blokland, M. Gerbracht |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Condensed matter physics Binding energy 02 engineering and technology Electron Spin structure Type (model theory) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials 0103 physical sciences Singlet state Atomic physics Triplet state 010306 general physics 0210 nano-technology Energy (signal processing) Quantum well |
| Zdroj: | Physical Review B. 83 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | A magneto-optical study of the energy and spin structure of charged excitons in a 20-nm-thick CdTe/Cd${}_{0.65}$Mg${}_{0.35}$Te quantum well is performed in strong magnetic fields up to 51 T. The type of resident carriers (holes or electrons) in the quantum well is controlled optically by above-barrier illumination, permitting a direct comparison of positively (T${}^{+}$) versus negatively (T${}^{\ensuremath{-}}$) charged excitons. The binding energies of the singlet states of these complexes behave qualitatively differently with increasing magnetic field $B$; namely, the binding energy decreases for ${\mathrm{T}}^{+}$ and increases for ${\mathrm{T}}^{\ensuremath{-}}$ with $B$. The triplet state of ${\mathrm{T}}^{+}$ is identified in strong fields with a binding energy smaller than that of the ${\mathrm{T}}^{\ensuremath{-}}$ triplet state. |
| Databáze: | OpenAIRE |
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