On the nature of exponential decrease of boson peak intensity tail, at increasing frequency higher than the peak position

In the present Letter, an exponential decrease of a boson peak intensity tail, at increasing frequency higher than the peak position, is predicted in the soft-mode model of low-energy glass dynamics for a series of glasses which exhibit a high-frequency sound above the peak. A similar theoretical interpretation is suggested for recent experimental data which show for some glasses a resembling behavior of the peak intensity tail.