Metastable states and macroscopic quantum tunneling in a cold atom Josephson ring

Details Metastable states and macroscopic quantum tunneling in a cold atom Josephson ring Metastable states and macroscopic quantum tunneling in a cold atom Josephson ring

2009-09-18

arxiv.org/abs/0909.3501v1

Phys. Rev. Lett. 104, 150405 (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.104.150405

We study macroscopic properties of a system of weakly interacting neutral bosons confined in a ring-shaped potential with a Josephson junction. We derive an effective low energy action for this system and evaluate its properties. In particular we find that the system possesses a set of metastable current-carrying states and evaluate the rates of transitions between these states due to macroscopic quantum tunneling. Finally we discuss signatures of different metastable states in the time-of-flight images and argue that the effect is observable within currently available experimental technique.

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