2 papers
cond-mat.other2004
On the internal modes in sine-Gordon chain
Jaroslaw E. Prilepsky, Alexander S. Kovalev
We address the issue of internal modes of a kink of a discrete sine-Gordon equation. The main point of the present study is to elucidate how the antisymmetric internal mode frequen…
nlin.PS2003
Instabilities and Bifurcations of Nonlinear Impurity Modes
Panayotis G. Kevrekidis, Yuri S. Kivshar, Alexander S. Kovalev
We study the structure and stability of nonlinear impurity modes in the discrete nonlinear Schr{ö}dinger equation with a single on-site nonlinear impurity emphasizing the effects o…