Simulation of supratransmission effect in nickel

For the first time, molecular dynamics simulations have been employed to investigate energy transfer in a three-dimensional fcc nickel lattice driven harmonically through a pair of neighboring atoms at frequencies lying outside the phonon spectrum. The dependence of the critical driving frequency on the driving amplitude was determined. When the driving frequency is below this threshold, energy is efficiently transmitted from the driven atoms into the lattice, leading to the spontaneous generation and emission of discrete breathers propagating in opposite directions along close-packed atomic rows. In contrast, when the driving frequency exceeds the critical value, energy transfer to the lattice ceases and the supratransmission effect is not observed. These findings provide new insights into nonlinear energy transport mechanisms in crystalline solids and the conditions necessary for the excitation of discrete breathers in three-dimensional metallic lattices.

1. The work was accomplished in terms of the State Assignment of the Institute for Metals Superplasticity Problems of the Russian Academy of Sciences financed by the Ministry of Science and Higher Education of the Russian Federation - 124022900108-3