Decay of superfluid currents in the interacting one-dimensional Bose gas
arXiv:0906.2314 · doi:10.1103/PhysRevA.80.043604
Abstract
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.
5 pages, 4 figures
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- From non equilibrium quantum Brownian motion to impurity dynamics in 1D quantum liquids
- Dynamic structure factor and drag force in a one-dimensional strongly-interacting Bose gas at finite temperature
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