Phase diagram for a Bose-Einstein condensate moving in an optical lattice
arXiv:0706.3946 · doi:10.1103/PhysRevLett.99.150604
Abstract
The stability of superfluid currents in a system of ultracold bosons was studied using a moving optical lattice. Superfluid currents in a very weak lattice become unstable when their momentum exceeds 0.5 recoil momentum. Superfluidity vanishes already for zero momentum as the lattice deep reaches the Mott insulator(MI) phase transition. We study the phase diagram for the disappearance of superfluidity as a function of momentum and lattice depth between these two limits. Our phase boundary extrapolates to the critical lattice depth for the superfluid-to-MI transition with 2% precision. When a one-dimensional gas was loaded into a moving optical lattice a sudden broadening of the transition between stable and unstable phases was observed.
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References in corpus (7)
- Spatial quantum noise interferometry in expanding ultracold atom clouds
- Imaging the Mott Insulator Shells using Atomic Clock Shifts
- Quantum Monte Carlo simulations of confined bosonic atoms in optical lattices
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- Decay of a superfluid currents in a moving system of strongly interacting bosons
- Superfluid-insulator transition in a moving system of interacting bosons
- Effect of quantum fluctuations on the dipolar motion of Bose-Einstein condensates in optical lattices
Cited by in corpus (16)
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- Collective modes and superflow instabilities of strongly correlated Fermi superfluids
- Stability of Superflow for Ultracold Fermions in Optical Lattices
- Dressed matter waves
- Heavily Damped Motion of One-Dimensional Bose Gases in an Optical Lattice
- Dipole oscillations of confined lattice bosons in one dimension
- Decay of superfluid currents in the interacting one-dimensional Bose gas
- Superfluid to Mott-insulator transition in an anizotropic two--dimensional optical lattice
- Stability of superfluid Fermi gases in optical lattices