Quantum eletrical phenomena at low temperatures

Quantum mechanism of interlayer polarization in layered crystals in alternating electric field in the limits of low temperatures is studied. Unbalanced density matrix is calculated for the ensemble of noninteracting protons, moving in onedimension multipit potential image of rectangular shape disturbed by variable polarizing field. Results of quantum-mechanical investigation of migratory polarization may be used in the study of tunnel mechanism of spontaneous polarization of ferrielectrics (KDP, DKDP).