On the possibility of a flare-up of discrete exciton absorption structure in n-CdxHg1−xTe crystals in a magnetic field |
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Authors: | VI Ivanov-Omskii SI Kokhanovskii RP Seysyan VA Smirnov VA Yukish SU Yuldashev AlL Efros |
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Institution: | Ioffe Physicotechnical Institute, Academy of Sciences of the U.S.S.R., Leningrad, 194021, U.S.S.R. |
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Abstract: | A discrete absorption peak with an exciton-like behavior was observed to flare up in CdxHg1?xTe with x≈0.3 when a magnetic field H was applied. Its diamagnetic shift, which is replaced at high H by a close-to-linear relationship typical for diamagnetic exciton spectroscopy, and the splitting permit one to evaluate ?g=0.2579±0.0001 eV and to calculate the band parameters of the material. Evaluation of the fluctuation potential well depth for the electrons and holes suggests, however, a high probability of exciton trapping at potential wells at H = 0 and x ≈ 0.3. Application of a magnetic field above 40 k0e can break the Coulomb bond between the electron and the hole, whereas at lower fields the existence of excitons is possible. |
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