University of Minnesota
School of Physics & Astronomy
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Alex Kamenev

“Critical Velocity of a Mobile Impurity in One-Dimensional Quantum Liquids”
M. Schecter, A. Kamenev, D. M. Gangardt, and A. Lamacraft, Phys. Rev. Lett. 108, 207001 (2012)

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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 Mc, 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