Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1999-09-28
Phys. Rev. E 61, 4454-4461 (2000).
Physics
Condensed Matter
Soft Condensed Matter
11 pages (LaTeX) and 14 figures (Postscript); submitted to Phys. Rev. E
Scientific paper
10.1103/PhysRevE.61.4454
We study effects of Kac-Baker long-range dispersive interaction (LRI) between particles on kink properties in the discrete sine-Gordon model. We show that the kink width increases indefinitely as the range of LRI grows only in the case of strong interparticle coupling. On the contrary, the kink becomes intrinsically localized if the coupling is under some critical value. Correspondingly, the Peierls-Nabarro barrier vanishes as the range of LRI increases for supercritical values of the coupling but remains finite for subcritical values. We demonstrate that LRI essentially transforms the internal dynamics of the kinks, specifically creating their internal localized and quasilocalized modes. We also show that moving kinks radiate plane waves due to break of the Lorentz invariance by LRI.
Gaididei Yuri B.
Majernikova Eva
Mingaleev Serge F.
Shpyrko Serge
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