A TWO-STATE MODEL FOR NON-EXPONENTIAL RELAXATION IN CONDENSED MATTER

A two-state model is presented for polarization relaxation in condensed matter. The dynamics of relaxation is treated with quantum transition theory. The physical meaning of the so-called time-dependent transition rate is clarified. The new model not only gives the fractional exponential and power-law relaxation functions naturally, but also indicates that the universality of the relaxation law results from the scaling behavior of low-frequency effective spectrum.