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Experimental observation of superdiffusive transport in random dimer lattices

: Naether, Uta; Stützer, Simon; Vicencio, Rodrigo A.; Molina, Mario; Tünnermann, Andreas; Nolte, Stefan; Kottos, Tsampikos; Christodoulides, Demetrios N.; Szameit, Alexander

Postprint (PDF; )

New journal of physics. Online journal 15 (2013), No.1, Art. 013045, 9 pp.
ISSN: 1367-2630
Journal Article, Electronic Publication
Fraunhofer IOF ()

We experimentally observe anomalous wavepacket evolution in a realization of a one-dimensional finite binary Anderson model in the presence of short-range correlations. To this end, we employ weakly-coupled optical waveguides with propagation constants epsilon1 and epsilon2. The correlations enforce the creation of dimers, i.e. two adjacent waveguides with the same epsilon, randomly placed along the lattice. A transition from a ballistic to a superdiffusive wavepacket expansion and, eventually, to localization is observed as the contrast between the two propagation constants increases.