Two-component localized vibrational modes in fcc metals

O. V. Bachurina () and A. A. Kudreyko
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O. V. Bachurina: Ufa State Petroleum Technological University
A. A. Kudreyko: Bashkir State Medical University

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 11, 1-9

Abstract: Abstract Discrete breathers (DB) are spatially localized vibrational modes of large amplitude in a defect-free crystal lattice. In this work, for the first time, two-dimensional DBs based on a two-component delocalized nonlinear vibrational mode (DNVM) are excited in a single (111) close-packed atomic plane in fcc metals (Al, Cu, and Ni). DNVM provides a pattern according to which the initial displacements of atoms from their equilibrium lattice positions are set. Classical molecular dynamics simulations have demonstrated the possibility to excite a long-lived two-dimensional DB with the energy of the order of 0.5–1.0 eV per oscillating atom. The two-dimensional DBs have a hard-type of nonlinearity and a lifetime of 12–24 ps, after which they decay into one-dimensional DBs, which, in turn, decay into zero-dimensional DBs, which also have a sufficiently long lifetime. A new class of two-dimensional DBs expands our understanding of the variety of spatially localized vibrational modes in nonlinear fcc lattices. Graphic abstract

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00227-3

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