Values of the transverse width as functions of the chemical potential for fundamental on-site solitons in model 1 (the ordinary model) are shown by curves, which are marked by triangles for the central site [in panel (a), the full and empty circles almost coincide]. full circles for the first neighbors, and empty circles for the second neighbors to the central site. In model 2 (the new system) the values of for fundamental on-site solitons are shown by dashed lines for the central site, dotted lines for the first neighbors, and dashed-dotted lines for the second neighbors to the central site. The intersite coupling constants are (a) and (b) .
The same as in Fig. 1 but for families of intersite solitons found in both models 1 and 2.
The cw solutions are unstable to modulational perturbations in regions below curves , which are determined by condition , see Eq. (29). The solid and dashed curves correspond to models 1 and 2, respectively. The figure pertains to and .
The norm (power) vs chemical potential for on-site fundamental solitons in both models 1 and 2. The coupling constants are (a) and (b) , which correspond to strongly discrete systems and quasicontinual systems, respectively.
The norm (power) vs chemical potential for intersite fundamental solitons in models 1 and 2. The coupling constants are (a) and (b) .
Free energy vs norm for on-site and intersite fundamental solitons in both models 1 and 2 for (a) and (b) . Solid and dashed lines correspond to the on-site solitons in models 2 and 1, respectively. Dotted and dashed-dotted lines represent, respectively, intersite solitons in models 2 and 1.
Pure real unstable eigenvalues (“ev”) for intersite unstaggered solitons in models 1 and 2 are shown by black and white circles, respectively, for . Note that in this case, pure real eigenvalues for on-site solitons have not been found.
The same as in Fig. 7 but at . In this case, plots (a) and (b) display the eigenvalues for the on-site solitons and intersite solitons, respectively.
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