The coherence time of polar slab

摘要

The relationship among the coherence time tau, variation frequency lambda, slab thickness d, energy separation Delta E, and coupling constant alpha in polar slab was investigated using Pekar-type variational method. The results indicated that the tau is positively proportional to the lambda, but the Delta E, d and alpha are negatively correlated with the tau. When Delta E is more than 10 eV, and d is less than 5 nm, tau decreases sharply.