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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2007. V. 10, N 2. P. 011-015.
Investigation of the direct/indirect exciton transition
in the double quantum well system based on Cd1-yMgyTe/Cd1-xMnxTe in applied magnetic field
Institute for Nuclear Research, NAS of Ukraine
47, prospect Nauky, Kyiv 03680, Ukraine
E-mail: sugakov@kinr.kiev.ua
Abstract. The energy levels, wave functions, and lifetimes of direct and indirect
excitons in a CdTe-based double quantum well system with non-magnetic (Mg) and
magnetic (Mn) ions in a magnetic field are found. It is shown that, in an external
magnetic field greater than some critical value, the lowest excited state of the system
becomes the indirect exciton state. Since the indirect exciton lifetime exceeds the direct
exciton one by a few orders of magnitude, the magnetic field can significantly influence
optical properties of the system (for example, the luminescence intensity). The realistic
range of parameters of a quantum well (well and barrier widths, Mn and Mg
concentrations, the magnetic field strength), in which the exciton lowest state is the
indirect exciton state, is calculated.
Keywords: double quantum well, indirect exciton, semimagnetic semiconductor.
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