Effects of charge-carrier drift on the electroacoustic interactions in piezoelectric semiconductors with spatial dispersion and induced chiral properties is studied. The wave numbers and ellipticities of eigenmodes of acoustic waves are found and effects of charge-carrier drift are investigated. Boundary-value problem for a slab under rotating electric field influence is solved.
We consider and compare three different cases of anisotropy compensation in chiral media. The first case concerns natural crystals or nonmagnetic superlattices, the second case is the class of stratified-periodic structures, which are homogeneous media in the long-wave approximation and have simultaneously dielectric and magnetic properties. The third possible case can be realized as inhomogeneous structures with spiral anisotropy of dielectric and magnetic properties.