Interaction of moving discrete breathers with vacancies

Details Interaction of moving discrete breathers with vacancies Interaction of moving discrete breathers with vacancies

2003-11-02

arxiv.org/abs/nlin/0311002v3

Physica D 216 (2006) 115--120

Nonlinear Sciences

Pattern Formation and Solitons

11 pages, 8 figures

Scientific paper

10.1016/j.physd.2005.12.022

In this paper a Frenkel--Kontorova model with a nonlinear interaction potential is used to describe a vacancy defect in a crystal. According to recent numerical results [Cuevas et al, Phys. Lett. A 315, 364 (2003)] the vacancy can migrate when it interacts with a moving breather. We study more thoroughly the phenomenology caused by the interaction of moving breathers with a single vacancy and also with double vacancies. We show that vacancy mobility is strongly correlated with the existence and stability properties of stationary breathers centered at the particles adjacent to the vacancy, which we will now call vacancy breathers.

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