Two-component localized vibrational modes in fcc metals

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...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2021-11, Vol.94 (11), Article 218
Main Authors: Bachurina, O. V., Kudreyko, A. A.
Format: Article
Language:English
Subjects:
Aluminum
Breathers
Complex Systems
Condensed Matter Physics
Copper
Crystal defects
Crystal lattices
Decay
Degassing of metals
Displacements (lattice)
Fluid- and Aerodynamics
Lattice vibration
Metals
Molecular dynamics
Nickel
Nonlinearity
Physics
Physics and Astronomy
Regular Article - Statistical and Nonlinear Physics
Solid State Physics
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Summary: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
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/s10051-021-00227-3