Título:
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Localization-delocalization wavepacket transition in Pythagorean aperiodic potentials
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Autor/a:
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Huang, Changming; Ye, Fangwei; Chen, Xianfeng; Kartashov, Yaroslav V.; Konotop, Vladimir V.; Torner, Lluis
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Otros autores:
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Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques |
Abstract:
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We introduce a composite optical lattice created by two mutually rotated square patterns and
allowing observation of continuous transformation between incommensurate and completely
periodic structures upon variation of the rotation angle θ. Such lattices acquire periodicity only for
rotation angles cosθ=a/c, sinθ=b/c, set by Pythagorean triples of natural numbers (a, b, c). While
linear eigenmodes supported by lattices associated with Pythagorean triples are always extended,
composite patterns generated for intermediate rotation angles allow observation of the localizationdelocalization
transition of eigenmodes upon modification of the relative strength of two sublattices
forming the composite pattern. Sharp delocalization of supported modes for certain θ values can be
used for visualization of Pythagorean triples. The effects predicted here are general and also take place
in composite structures generated by two rotated hexagonal lattices |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Física -Optical lattices -wavepacket transition -Fotònica |
Derechos:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
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Artículo - Versión publicada Artículo |
Editor:
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Nature
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Compartir:
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