Critical velocity of a mobile impurity in one-dimensional quantum liquids

Details Critical velocity of a mobile impurity in one-dimensional quantum liquids Critical velocity of a mobile impurity in one-dimensional quantum liquids

2011-10-12

arxiv.org/abs/1110.2788v2

Physics

Condensed Matter

Quantum Gases

5 pages, 2 figures; New version with Supplemental Material (3 pages, 6 figures); Accepted to PRL

Scientific paper

We study the notion of superfluid critical velocity in one spatial dimension. It is shown that for heavy impurities with mass $M$ exceeding a critical mass $M_\mathrm{c}$, the dispersion develops periodic metastable branches resulting in dramatic changes of dynamics in the presence of an external driving force. In contrast to smooth Bloch Oscillations for $M

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