Highly symmetric discrete breather in a two-dimensional Morse crystal

E. A. Korznikova, S. Yu Fomin, E. G. Soboleva, S. V. Dmitriev

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

It has been shown recently that a moving discrete breathers localized in one close-packed atomic row can be excited in a two-dimensional monoatomic crystal with Morse interaction. In this work, a motionless discrete breathers having the threefold symmetry axis has been excited in the same crystal. The initial conditions for the excitation of such discrete breathers are set by the superposition of a bell-shaped function on a planar nonlinear phonon mode with the wave vector lying at the edge of the Brillouin zone. In addition, the displacement of the centers of atomic oscillations from the center of the discrete breathers owing to the asymmetry of the Morse potential is taken into account. The results obtained make it possible to approach the search for highly symmetric discrete breathers in three-dimensional crystals.

Original languageEnglish
Pages (from-to)277-281
Number of pages5
JournalJETP Letters
Volume103
Issue number4
DOIs
Publication statusPublished - 1 Feb 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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