An electret model based on the two-level system theory

On the basis of the concept of a two-line density matrix and considering the tunneling effect a set of simultaneous differential equations is derived relating all its components. An equation is obtained describing the polarization vector relaxation in an electret. The relaxation parameter corresponding to the polarization vector total relaxation time is calculated microscopically. A system of differential equations allowing for the effect on the atoms of a strongly oscillating classical electric field is proposed. An analytical formula for thermal current in an electret is obtained and the behavior of two-level systems in a high-frequency electric field is analyzed.