title: Spin-orbit-coupled Bose-Einstein condensates in a one-dimensional optical lattice.
abstract: We investigate a spin-orbit-coupled Bose-Einstein condensate loaded into a translating optical lattice. We experimentally demonstrate the lack of Galilean invariance in the spin-orbit-coupled system, which leads to anisotropic behavior of the condensate depending on the direction of translation of the lattice. The anisotropy is theoretically understood by an effective dispersion relation. We experimentally confirm this theoretical picture by probing the dynamical instability of the system.
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USA.
authors.forename: C
authors.initials: C
authors.lastname: Hamner
authors.affiliation: The University of Queensland, School of Mathematics and Physics, St Lucia, Queensland 4072, Australia.|Quantum Systems Unit, OIST Graduate University, Onna, Okinawa 904-0495, Japan.
authors.forename: Yongping
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Khamehchi
authors.affiliation: The University of Queensland, School of Mathematics and Physics, St Lucia, Queensland 4072, Australia.
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Davis
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USA.
authors.forename: P
authors.initials: P
authors.lastname: Engels