A ring of BEC pools as a trap for persistent flow
2011
Online
unknown
Zugriff:
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 $\tau_Q$.
Comment: Decompressed version to appear in Phys. Rev. B
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A ring of BEC pools as a trap for persistent flow
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Autor/in / Beteiligte Person: | Dziarmaga, Jacek ; Zurek, Wojciech H. ; Tylutki, Marek |
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Veröffentlichung: | 2011 |
Medientyp: | unknown |
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