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- W2915016502 abstract "Properties of discrete breathers are discussed from two points of view: (I) the ab initio modeling in graphene and (II) classical molecular dynamics simulations in the ace-centered cubic (fcc) Ni. In the first (I) approach, the possibility of exciting breathers depends on the strain applied to the graphene sheet. The uniaxial strain leads to opening the gap in the phonon band and, therefore, the existence of breathers with frequencies within the gap. In the second (II) approach, the structure of fcc Ni supports breathers of another kind, which possess a hard nonlinearity type. It is shown that particular high frequency normal mode can be used to construct the breather by means of overlaying a spherically symmetrical function, the maximum of which coincides with the breather core. The approach of breathers excitation based on nonlinear normal modes is independent of the level of approximation. Even though breathers could be obtained both in classical and first-principles calculations, each case has advantages and shortcomings, that are compared in the present work." @default.
- W2915016502 created "2019-02-21" @default.
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- W2915016502 date "2019-06-01" @default.
- W2915016502 modified "2023-10-16" @default.
- W2915016502 title "Discrete breathers modeling from first principles in graphene and in classical approximation in fcc Ni: Comparison" @default.
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- W2915016502 doi "https://doi.org/10.1142/s2424913019500024" @default.
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