Abstract
The appearance of new types of bound (“dark”) states in the continuous spectrum of shear phonons of the radiation field of leaky magnon polarons in an acoustically open “easy-axis antiferromagnet–superconductor” sandwich structure can be determined by the relative orientation of the plane of incidence of a transverse elastic wave and the equilibrium antiferromagnetism vector in the interface plane between the media. The effect is based on the elastic dipole mechanism of the formation of magneto-acoustic birefringence with a change of the refraction cavity induced by the symmetric or antisymmetric Dzyaloshinskii interaction.
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