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• W1998009574 abstract "A technique called cyclotron-resonance-excitation spectroscopy has been used to obtain photoconductivity spectra for crystals of the II-VI compound semiconductor CdTe. A 35-GHz electron-spin-resonance spectrometer is used to detect the cyclotron resonance of free carriers created by 680--785-nm laser excitation at 2 K. The cyclotron-resonance signal consists of two major components, attributed to high-mobility electrons (ensuremath{mu}g${10}^{5}$ ${mathrm{cm}}^{2}$/V s) in n-type regions and to lower-mobility electrons (or possibly light holes) in compensated regions of the sample. Persistent photoconductivity effects are observed. The excitation spectrum (i.e., the laser wavelength dependence of the cyclotron-resonance signal) is studied with emphasis on the ensuremath{approxeq}15-meV-wide excitonic region just below the band-gap energy (1.606 eV). Strong peaks in this region of the spectrum demonstrate that carriers are generated more efficiently just below the band gap than above it. Dips occur in the spectrum at the 1s and 2s exciton energies. Two carrier-generation mechanisms are proposed for the excitonic region: (a) inelastic polariton scattering off neutral donors, ionizing the donors and (b) annihilation of polaritons by ionized acceptors, neutralizing the acceptors. Properties of importance in determining the polariton-impurity interactions are the two-branch polariton dispersion relation, the excitonic content of the polariton wave function, and the polariton group velocity and kinetic energy." @default.
• W1998009574 created "2016-06-24" @default.
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• W1998009574 date "1991-05-15" @default.
• W1998009574 modified "2023-09-26" @default.
• W1998009574 title "Polariton-impurity interactions and photoconductivity in CdTe studied by cyclotron-resonance-excitation spectroscopy" @default.
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• W1998009574 doi "https://doi.org/10.1103/physrevb.43.12374" @default.
• W1998009574 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9997034" @default.
• W1998009574 hasPublicationYear "1991" @default.
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