Oscillations of Bose condensates in a one-dimensional optical superlattice

Abstract

Oscillations of atomic Bose-Einstein condensates in a 1D optical lattice with a two-point basis is investigated. In the low-frequency regime, four branches of modes are resolved, that correspond to the transverse in-phase and out-of-phase breathing modes, and the longitudinal acoustic and optical phonon modes of the condensates. Dispersions of these modes depend intimately on the values of two intersite Josephson tunneling strengths, $J_1$ and $J_2$, and the on-site repulsion $U$ between the atoms. Observation of these mode dispersions is thus a direct way to access them.

5 pages,2 figures

References in corpus (10)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Theory of Bose-Einstein condensation in trapped gases
• Cold bosonic atoms in optical lattices
• Quantum phases in an optical lattice
• Band structure, elementary excitations, and stability of a Bose-Einstein condensate in a periodic potential
• Macroscopic dynamics of a trapped Bose-Einstein condensate in the presence of 1D and 2D optical lattices
• Excitations of a Superfluid in a 3D Optical Lattice
• Bogoliubov sound speed in periodically modulated Bose-Einstein condensates
• Ensemble Quantum Computation with atoms in periodic potentials
• Longitudinal sound mode of a Bose-Einstein condensate in an optical lattice

Cited by in corpus (6)

• Controlling transition probability from matter-wave soliton to chaos
• High- and low-frequency phonon modes in dipolar quantum gases trapped in deep lattices
• Superfluid Dynamics of a Bose-Einstein Condensate in a One Dimensional Optical Super-Lattice
• Using modified Gaussian distribution to study the physical properties of one and two-component ultracold atoms
• Coherence Properties of a Bose-Einstein Condensate in an Optical Superlattice
• Luttinger liquid in superlattice structures: atomic gases, quantum dots and the classical Ising chain