A ring of BEC pools as a trap for persistent flow

Details A ring of BEC pools as a trap for persistent flow A ring of BEC pools as a trap for persistent flow

2011-03-03

arxiv.org/abs/1103.0669v2

Phys. Rev. B 84, 094528 (2011)

Physics

Condensed Matter

Quantum Gases

Decompressed version to appear in Phys. Rev. B

Scientific paper

Mott insulator - superfluid transition in a periodic lattice of Josephson junctions can be driven by tunneling rate increase. Resulting winding numbers $W$ of the condensate wavefunction decrease with increasing quench time in accord with the Kibble-Zurek mechanism (KZM). However, in very slow quenches Bose-Hubbard dynamics rearranges wavefunction phase so that its random walk cools, $\bar{W^2}$ decreases and eventually the wavefunction becomes too cold to overcome potential barriers separating different $W$. Thus, in contrast with KZM, in very slow quenches $\bar{W^2}$ is set by random walk with "critical" step size, independently of $\tau_Q$.

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