title: Subdiffractive band-edge solitons in Bose-Einstein condensates in periodic potentials.
abstract: A type of matter wave diffraction management is presented that leads to subdiffractive solitonlike structures. The proposed management technique uses two counter-moving, identical periodic potentials (e.g., optical lattices). For suitable lattice parameters, a different type of atomic bandgap structure appears in which the effective atomic mass becomes infinite at the lowest edge of an energy band. This way, normal matter-wave diffraction (proportional to the square of the atomic momentum) is replaced by fourth-order diffraction, and hence the evolution of the system becomes subdiffractive.
authors.affiliation: Institució Catalana de Recerca i Estudis Avançats (ICREA), Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Colom 11, 08222 Terrassa, Spain.
authors.forename: Kestutis
authors.initials: K
authors.lastname: Staliunas
authors.forename: Ramon
authors.initials: R
authors.lastname: Herrero
authors.forename: Germán J
authors.initials: GJ
authors.lastname: de Valcárcel