Abstract
AbstractVarious aspects of the microscopic description of the natural optical activity of ionic dielectric crystals are discussed. In the presented approach the electron and phonon excitations as well as their interactions are taken into account. The crystalline contributions to the effect and contributions from single ions or ionic groups are separated; they are studied in detail. Formalism of the Hubbard operators and two‐time Green functions method give the possibility to develop the theory of gyrotropy for a wide family of crystals having a complicated structure of the spectrum of active electron levels. Using the mechanical exciton conception the possibility to apply the crystal point symmetry is demonstrated.
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