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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.88: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

localization-delocalization transition in double-well optical lattices — •gang wang — Max Planck Institute for the Physics of Complex Systems

Ultracold atoms in optical lattices allow for the study of localization of quantum waves. Within the framework of 1D incommensurate optical lattice, a sharp transition from all eigenstates being extended to all being localized occurs in one dimension, so-called self-duality in the Harper model. This transition has been observed with ultracold atoms loaded in optical lattices. We investigated the localization properties of ultracold atoms loaded in double-well optical lattices, perturbed by a secondary incommensurate lattice to induce the deterministic disorder potential. We found the localization-delocalization transition qualitatively different from those of the Harper model, signaled by the appearance of energy-dependent mobility edges and broken duality.