Matter waves in atomic artificial graphene Auteur(s): Bartolo N., Antezza M. (Article) Publié: Europhysics Letters (Epl), vol. 107 p.30006 (2014) Texte intégral en Openaccess : Ref HAL: hal-01054237_v1 DOI: 10.1209/0295-5075/107/30006 WoS: 000340780100006 Exporter : BibTex | endNote 3 Citations Résumé: We present a new model to realize artificial 2D lattices with cold atoms investigating the atomic artificial graphene: a 2D confined matter wave is scattered by atoms of a second species trapped around the nodes of a honeycomb optical lattice. The system allows an exact determination of the Green function, hence of the transport properties. The inter-species interaction can be tuned via the interplay between scattering length and confinements. Band structure and density of states of a periodic lattice are derived for different values of the interaction strength. Emergence and features of Dirac cones are pointed out, together with the appearance of multiple gaps and a non-dispersive and isolated flat band. Robustness against finite-size and vacancies effects is numerically investigated. |