Heavily Damped Motion of One-Dimensional Bose Gases in an Optical Lattice

Abstract

We study the dynamics of strongly correlated one-dimensional Bose gases in a combined harmonic and optical lattice potential subjected to sudden displacement of the confining potential. Using the time-evolving block decimation method, we perform a first-principles quantum many-body simulation of the experiment of Fertig {\it et al.} [Phys. Rev. Lett. {\bf 94}, 120403 (2005)] across different values of the lattice depth ranging from the superfluid to the Mott insulator regimes. We find good quantitative agreement with this experiment: the damping of the dipole oscillations is significant even for shallow lattices, and the motion becomes overdamped with increasing lattice depth as observed. We show that the transition to overdamping is attributed to the decay of superfluid flow accelerated by quantum fluctuations, which occurs well before the emergence of Mott insulator domains.

4 pages, 5 figures, published version

References in corpus (6)

• Classical simulation of infinite-size quantum lattice systems in one spatial dimension
• Phase diagram for a Bose-Einstein condensate moving in an optical lattice
• Decay of a superfluid currents in a moving system of strongly interacting bosons
• Effect of quantum fluctuations on the dipolar motion of Bose-Einstein condensates in optical lattices
• Numerical simulations of strongly correlated fermions confined in 1D optical lattices
• Landau damping: instability mechanism of superfluid Bose gases moving in optical lattices

Cited by in corpus (7)

• Ground states and dynamics of population-imbalanced Fermi condensates in one dimension
• Dipole oscillations of confined lattice bosons in one dimension
• Noise correlations of one-dimensional Bose mixtures in optical lattices
• Density Modulations Associated with the Dynamical Instability in the Bose-Hubbard Model
• Dipolar Dynamics for Interacting Ultracold Fermions in a Trapped Optical Lattice
• Mode folding in systems with local interaction: unitary and non-unitary transformations using tensor states
• Quantum Effects In Low Temperature Bosonic Systems