ИНЖЕНЕРИЯ ТЕПЛОВЫХ ПОТОКОВ В ПЛОСКИХ НАНОСТРУКТУРАХ

Денис НИКА, Надежда ЗИНЧЕНКО, Евгений ПОКАТИЛОВ Лаборатория физики многослойных структур и молекулярного магнетизма

Abstract

In the paper is shown that one can obtain the decreasing of thermal fl ux in heterostructure in comparison with thermal fl ux in the slab covering the heat conducting nanoslab with claddings with smaller elasticity constants. As an example, the Si-based heterostructure was chosen. The dispersion relations for acoustic phonons were obtained in the framework of molecular-dynamic Face-centered cubic cell model. It is shown, that there are three types of phonon modes in threelayered heterostructure: (1) “common” modes (distributed over whole heterostructure thickness), (2) “internal” modes and (3) “external” modes, which are concentrated mainly in the core and cladding layers correspondingly. One can reach the thermal fl ux decreasing, enhancing the phonon external boundary scattering of “common” modes.