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Existence and stability of multisite breathers in honeycomb and hexagonal lattices
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Koukouloyannis, V., Kevrekidis, P. G., Law, K. J. H., Kourakis, I. and Frantzeskakis, D. J. (2010) Existence and stability of multisite breathers in honeycomb and hexagonal lattices. Journal of Physics A: Mathematical and Theoretical, Vol.43 (No.23). Article no. 235101. doi:10.1088/1751-8113/43/23/235101 ISSN 1751-8113.
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Official URL: http://dx.doi.org/10.1088/1751-8113/43/23/235101
Abstract
We study the existence and stability of multisite discrete breathers in two prototypical non-square Klein–Gordon lattices, namely a honeycomb and a hexagonal one. In the honeycomb case we consider six-site configurations and find that for soft potential and positive coupling the out-of-phase breather configuration and the charge-two vortex breather are linearly stable, while the in-phase and charge-one vortex states are unstable. In the hexagonal lattice, we first consider three-site configurations. In the case of soft potential and positive coupling, the in-phase configuration is unstable and the charge-one vortex is linearly stable. The out-of-phase configuration here is found to always be linearly unstable. We then turn to six-site configurations in the hexagonal lattice. The stability results in this case are the same as in the six-site configurations in the honeycomb lattice. For all configurations in both lattices, the stability results are reversed in the setting of either hard potential or negative coupling. The study is complemented by numerical simulations which are in very good agreement with the theoretical predictions. Since neither the form of the on-site potential nor the sign of the coupling parameter involved have been prescribed, this description can accommodate inverse-dispersive systems (e.g. supporting backward waves) such as transverse dust-lattice oscillations in dusty plasma (Debye) crystals or analogous modes in molecular chains.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||
Journal or Publication Title: | Journal of Physics A: Mathematical and Theoretical | ||||
Publisher: | IOP Publishing Ltd | ||||
ISSN: | 1751-8113 | ||||
Official Date: | 2010 | ||||
Dates: |
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Volume: | Vol.43 | ||||
Number: | No.23 | ||||
Page Range: | Article no. 235101 | ||||
DOI: | 10.1088/1751-8113/43/23/235101 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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