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We present the results of analysis for the refractive indices and the ellipticity of eigen waves under the conditions of coexisting gyration and weak optical activ- ity. Quantitative relations describing the appropriate parameters are derived. It is shown that the ellipticities of eigen waves become different and one of that waves acquires a complicated (longitudinally-transverse) elliptical polarisation state. This represents a new type of electromagnetic eigen waves in crystals.

Coexistence of ordinary gyration and weak optical activity in crystals: eigen waves of a new type