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Discrete flat-band solitons in the kagome lattice
University of Chile, Chile.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-6708-1560
2013 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 87, no 6Article in journal (Refereed) Published
Abstract [en]

We consider a model for a two-dimensional kagome lattice with defocusing nonlinearity, and show that families of localized discrete solitons may bifurcate from localized linear modes of the flat band with zero power threshold. Each family of such fundamental nonlinear modes corresponds to a unique configuration in the strong-nonlinearity limit. By choosing well-tuned dynamical perturbations, small-amplitude, strongly localized solutions from different families may be switched into each other, as well as moved between different lattice positions. In a window of small power, the lowest-energy state is a symmetry-broken localized state, which may appear spontaneously.

Place, publisher, year, edition, pages
American Physical Society , 2013. Vol. 87, no 6
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-96468DOI: 10.1103/PhysRevA.87.061803ISI: 000320764300001OAI: diva2:642922
Available from: 2013-08-23 Created: 2013-08-20 Last updated: 2014-01-13

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