Fizika Nizkikh Temperatur: Volume 47, Number 5 (May 2021), p. 446-453    ( to contents , go back )

Debye model for the surface phonons

Yu. M. Poluektov

National Science Center “Kharkov Institute of Physics and Technology” Kharkov 61108, Ukraine
E-mail: yuripoluektov@kipt.kharkov.ua
pos Анотація:626

Received December 22, 2020, revised February 3, 2021, published online March 26, 2021

Abstract

A quantum description of the surface waves in an isotropic elastic body without the use of the semiclassical quantization is proposed. The problem about the surface waves is formulated in the Lagrangian and Hamiltonian representations. Within the framework of the generalized Debye model, the contribution of the surface phonons (“rayleighons”) to thermodynamic functions is calculated. It is emphasized that the role of the surface phonons can be significant and even decisive in low-dimensional systems, granular and porous media, and that their contribution to the total heat capacity increases with decreasing temperature.

Key words: Rayleigh surface waves, phonon, Debye model, entropy, heat capacity.

Download 387810 byte View Contents