Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-06-12
Phys. Rev. A 80, 043604 (2009)
Physics
Condensed Matter
Quantum Gases
5 pages, 4 figures
Scientific paper
10.1103/PhysRevA.80.043604
We examine the superfluid properties of a 1D Bose gas in a ring trap based on the model of Lieb and Liniger. While the 1D Bose gas has nonclassical rotational inertia and exhibits quantization of velocities, the metastability of currents depends sensitively on the strength of interactions in the gas: the stronger the interactions, the faster the current decays. It is shown that the Landau critical velocity is zero in the thermodynamic limit due to the first supercurrent state, which has zero energy and finite probability of excitation. We calculate the energy dissipation rate of ring currents in the presence of weak defects, which should be observable on experimental time scales.
Brand Joachim
Caux Jean-Sebastien
Cherny Alexander Yu.
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