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- W122207688 abstract "As a result of Coulomb binding of electrons and holes into excitons, a system can resonantly absorb energy from a microwave electromagnetic field. In addition to information about the structure of the conduction and valence bands, obtained by means of spin resonance of the conduction electrons (holes), exciton paramagnetic resonance can yield information about the exciton energy spectrum. This chapter discusses the contribution to the exciton spin–lattice relaxation of the dynamic contact hyperfine interaction between electron components of free excitons (s electrons of the conduction band, which are coupled with holes from the valence band during the formation of free excitons) with the nuclear spins of a crystal lattice. Despite the complete averaging of the hyperfine interaction during the motion of the individual exciton, the hyperfine interaction with the nuclear spin ensemble makes a nonzero contribution to the linewidth of the exciton paramagnetic resonance.Exciton paraelectric resonance is also discussed. While localized paraelectric centers tunnel between equilibrium positions, excitons can absorb energy from the resonant electric field and transfer that energy to the crystal lattice. The paraelectric resonance of excitons, despite sufficient evidence of its existence, has not previously been considered, either in molecular crystals or in semiconductors. An interesting feature of exciton paraelectric resonance in semiconductors is the lack of an isotopic shift for the intraserial exciton transitions and the presence of a large isotopic shift for resonances.Finally, this chapter introduces and theoretically justifies the idea of using a large set of initial splittings of exciton levels in crystal fields of different semiconductors to generate coherent electromagnetic radiation in submillimeter and far-IR ranges at intra- and interserial exciton transitions and also to generate coherent magnons by excitons in magnetic semiconductors.KeywordsElectron Paramagnetic Resonance SpectrumSpin WaveIsotopic ShiftExciton StateExciton BandThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
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- W122207688 date "2013-01-01" @default.
- W122207688 modified "2023-09-24" @default.
- W122207688 title "Exciton Paramagnetic, Paraelectric, and Zero-Field Resonances" @default.
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- W122207688 doi "https://doi.org/10.1007/978-3-642-35807-4_2" @default.
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