The European Physical Journal B ( IF 1.6 ) Pub Date : 2021-10-29 , DOI: 10.1140/epjb/s10051-021-00227-3 O. V. Bachurina 1 , A. A. Kudreyko 2
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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
中文翻译：
fcc 金属中的双分量局域振动模式
摘要
离散呼吸器 (DB) 是无缺陷晶格中大振幅的空间局部振动模式。在这项工作中，首次在 fcc 金属（Al、Cu 和 Ni）中的单个（111）密堆积原子平面中激发了基于双组分离域非线性振动模式（DNVM）的二维 DB . DNVM 提供了一种模式，根据该模式设置原子从其平衡晶格位置的初始位移。经典的分子动力学模拟已经证明了以每个振荡原子 0.5-1.0 eV 的能量激发长寿命二维 DB 的可能性。二维 DB 具有硬型非线性，寿命为 12-24 ps，之后它们衰减为一维 DB，然后又衰减为零维 DB，也有足够长的使用寿命。一类新的二维 DB 扩展了我们对非线性 fcc 晶格中各种空间局部振动模式的理解。
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