Translation-Invariant Excitons in a Phonon Field
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Published:2021-06-06
Issue:2
Volume:6
Page:20
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ISSN:2410-3896
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Container-title:Condensed Matter
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language:en
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Short-container-title:Condensed Matter
Abstract
Large-radius excitons in polar crystals are considered. It is shown that translation invariant description of excitons interacting with a phonon field leads to a nonzero contribution of phonons into the exciton ground state energy only in the case of weak or intermediate electron-phonon coupling. A conclusion is made that self-trapped excitons cannot exist in the limit of strong coupling. Peculiarities of the absorption and emission spectra of translation invariant excitons in a phonon field are discussed. Conditions when the hydrogen-like exciton model remains valid in the case of electron-phonon interaction are found.
Subject
Condensed Matter Physics,Electronic, Optical and Magnetic Materials
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