Abstract
This first chapter introduces the basic concept of an exciton as an elementary excitation in a many-electron system of an insulator. Various kinds of interaction associated with translational and internal motions of this composite particle, such as electron-hole Coulomb and exchange interactions, spin-orbit interactions and interatomic or intermolecular overlap and dipole-dipole energies, are described with particular attention to their interplay and to their reflection in the optical spectra. The coupled mode of light and electronic polarization waves, whose quanta are a photon and an exciton, respectively, is described in terms of a polariton picture, whereby the optical response of the bulk is related to that of the surface, with additional boundary conditions in the case of spatial dispersion. This chapter provides the conceptual basis for more dynamical aspects of the excitons to be described in later chapters.
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Ueta, M., Kanzaki, H., Kobayashi, K., Toyozawa, Y., Hanamura, E. (1986). Introduction. In: Excitonic Processes in Solids. Springer Series in Solid-State Sciences, vol 60. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82602-3_1
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DOI: https://doi.org/10.1007/978-3-642-82602-3_1
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