Instituto de Ciencia de Materiales de Madrid
     Condensed Matter Theory    
   Sigmund Kohler home | cv | research | publications  

Chemical-potential standard for atomic Bose-Einstein condensates

Sigmund Kohler and Fernando Sols
New J. Phys. 5, 94 (2003)
When subject to an external time periodic perturbation of frequency f, a Josephson-coupled two-state Bose-Einstein condensate may respond with a constant chemical potential difference 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 can 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 favour the achievement of a stable and accurate chemical potential difference between the macroscopic condensates.
arXiv:cond-mat/0305045

[ICMM-CSIC] [Condensed Matter Theory]
last modified: 18.11.2024 by Sigmund Kohler