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• W2108295097 abstract "In a uniform ring-shaped one-dimensional superfluid, quantum fluctuations that unwind the order parameter need to transfer momentum to quasiparticles (phonons). We present a detailed calculation of the leading exponential factor governing the rate of such phonon-assisted tunneling in a weakly coupled Bose gas at a low temperature $T$. We also estimate the preexponent. We find that for small superfluid velocities the $T$ dependence of the rate is given mainly by $mathrm{exp}(ensuremath{-}{c}_{s}P∕2T)$, where $P$ is the momentum transfer and ${c}_{s}$ is the phonon speed. At low $T$, this represents a strong suppression of the rate compared to the nonuniform case. As a part of our calculation, we identify a complex instanton whose analytical continuation to suitable real-time segments is real and describes formation and decay of coherent quasiparticle states with nonzero total momenta." @default.
• W2108295097 created "2016-06-24" @default.
• W2108295097 creator A5066798564 @default.
• W2108295097 date "2005-01-14" @default.
• W2108295097 modified "2023-09-27" @default.
• W2108295097 title "Tunneling in a uniform one-dimensional superfluid: Emergence of a complex instanton" @default.
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• W2108295097 doi "https://doi.org/10.1103/physreva.71.013602" @default.
• W2108295097 hasPublicationYear "2005" @default.
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