Abstract
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 α 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.
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