Superfluidity of the 1D Bose gas Superfluidité du gaz de Bose 1D

Superfluidity of the 1D Bose gas

We have investigated the superfluid properties of a ring of weakly interacting and degenerate 1D Bose gas at thermal equilibrium with a rotating vessel. The conventional definition of superfluidity predicts that the gas has a significant superfluid fraction only in the Bose condensed regime. In the opposite regime, it is found that a superfluid behaviour can still be identified when the probabi...

Do Bose metals exist in Nature?

We revisit the concept of superfluidity in bosonic lattice models in low dimensions. Then, by using numerical and analytical results obtained previously for equivalent spinless fermion models, we show that the gapless phase of 1D interacting bosons may be either superfluid or remarkablymetallic and not superfluid. The latter phase -the Bose metalshould be, according to the mentioned results, a ...

One-dimensional Bose gas on an atom chip

We describe experiments investigating the (coherence) properties of a finitetemperature one-dimensional (1D) Bose gas with repulsive interactions. The confining magnetic field is generated with a micro-electronic circuit. This microtrap for atoms or ‘atom chip’ is particularly suited to generate a tight waveguide for atoms close to the chip surface. In contrast to the usual case of Bose-Einstei...

Ultracold Bose Gases in 1D Disorder: From Lifshits Glass to Bose-Einstein Condensate

Strongly inhibited transport of a degenerate 1D Bose gas in a lattice.

We report the observation of strongly damped dipole oscillations of a quantum degenerate 1D atomic Bose gas in a combined harmonic and optical lattice potential. Damping is significant for very shallow axial lattices (0.25 photon recoil energies), and increases dramatically with increasing lattice depth, such that the gas becomes nearly immobile for times an order of magnitude longer than the s...