Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-05-02
New J. Phys. 5, 94 (2003)
Physics
Condensed Matter
Soft Condensed Matter
13 pages, 4 figures
Scientific paper
10.1088/1367-2630/5/1/394
When subject to an external time periodic perturbation of frequency $f$, a Josephson-coupled two-state Bose-Einstein condensate responds with a constant chemical potential difference $\Delta\mu=khf$, where $h$ is Planck's constant and $k$ is an integer. We propose an experimental procedure to produce ac-driven atomic Josephson devices that may be used to define a standard of chemical potential. We investigate how to circumvent some of the specific problems derived from the present lack of advanced atom circuit technology. We include the effect of dissipation due to quasiparticles, which is essential to help the system relax towards the exact Shapiro resonance, and set limits to the range of values which the various physical quantities must have in order to achieve a stable and accurate chemical potential difference between the macroscopic condensates.
Kohler Sigmund
Sols Fernando
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