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External Magnetic Field Induced Conical Singularities in the Isofrequency Surface of a Ferrite-semiconductor Metamaterial

In the current paper the peculiarities of a two-sheeted isofrequency surface of a superlattice, which includes alternating gyroelectric and gyromagnetic layers, are studied. The superlattice is considered in the subwavelength regime when it can be represented as a biaxial metamaterial with effective permittivity and permeability tensors. The particular attention is devoted to the study of a conical singularity points (analogs of Dirac points), which occur when the isofrequency surfaces of ordinary and extraordinary waves intersect, leading to the conical refraction phenomenon. It has been shown that effective control over the isofrequency surface types and topological transition points is possible by appropriately choosing the physical and geometrical parameters of the structure under study.