https://doi.org/10.1140/epjb/s10051-021-00227-3
Regular Article - Statistical and Nonlinear Physics
Two-component localized vibrational modes in fcc metals
1
Ufa State Petroleum Technological University, Kosmonavtov str. 1, 450062, Ufa, Russia
2
Bashkir State Medical University, Lenin str. 3, 450008, Ufa, Russia
Received:
14
July
2021
Accepted:
12
October
2021
Published online:
29
October
2021
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.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021
