The nonlinear Dirac equation in Bose-Einstein condensates: I. relativistic solitons in armchair nanoribbon optical lattices
We present a thorough analysis of soliton solutions to the quasi-one-dimensional (quasi-1D) nonlinear Dirac equation (NLDE) for a Bose-Einstein condensate in a honeycomb lattice with armchair geometry. Our NLDE corresponds to a quasi-1D reduction of the honeycomb lattice along the zigzag direction,...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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25 June 2015
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New journal of physics
Year: 2015, Jahrgang: 17, Heft: 6, Pages: 1-23 |
| ISSN: | 1367-2630 |
| DOI: | 10.1088/1367-2630/17/6/063033 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1367-2630/17/6/063033 Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.1088/1367-2630/17/6/063033 
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| Verfasserangaben: | L.H. Haddad, C.M. Weaver and Lincoln D. Carr |
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| 245 | 1 | 4 | |a The nonlinear Dirac equation in Bose-Einstein condensates |b I. relativistic solitons in armchair nanoribbon optical lattices |c L.H. Haddad, C.M. Weaver and Lincoln D. Carr |
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| 520 | |a We present a thorough analysis of soliton solutions to the quasi-one-dimensional (quasi-1D) nonlinear Dirac equation (NLDE) for a Bose-Einstein condensate in a honeycomb lattice with armchair geometry. Our NLDE corresponds to a quasi-1D reduction of the honeycomb lattice along the zigzag direction, in direct analogy to graphene nanoribbons. Excitations in the remaining large direction of the lattice correspond to the linear subbands in the armchair nanoribbon spectrum. Analytical as well as numerical soliton Dirac spinor solutions are obtained. We analyze the solution space of the quasi-1D NLDE by finding fixed points, delineating the various regions in solution space, and through an invariance relation which we obtain as a first integral of the NLDE. We obtain spatially oscillating multi-soliton solutions as well as asymptotically flat single soliton solutions using five different methods: by direct integration; an invariance relation; parametric transformation; a series expansion; and by numerical shooting. By tuning the ratio of the chemical potential to the nonlinearity for a fixed value of the energy-momentum tensor, we can obtain both bright and dark solitons over a nonzero density background. | ||
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| 700 | 1 | |a Carr, Lincoln D. |e VerfasserIn |0 (DE-588)142813885 |0 (DE-627)704316900 |0 (DE-576)347893368 |4 aut | |
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