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Atomic tunnel arrays B.P. Anderson and M.A. Kasevich

Summary: Atomic tunnel arrays
B.P. Anderson and M.A. Kasevich
Physics Department, Yale University, New Haven, CT 06520-8120, USA
1. Introduction
The demonstration of Bose-Einstein condensation in atomic gases [1] raises the possi-
bility of exploring relationships between coherence properties of atom vapor condensates
[2, 3, 4, 5], superfluid He [6, 7], and superconductivity [8]. These quantum systems share
common theoretical framework and exhibit similar observable characteristics. In this lec-
ture, we discuss observed behavior [9] of an optically trapped Bose-Einstein condensate
(BEC) analogous to the Josephson effect of superconducting systems.
2. Josephson effects in superconductors
Josephson effects are a range of phenomena exhibited by two superconductors sepa-
rated by a thin insulating barrier. Cooper pair electron tunneling through the barrier
couples the dynamics of the two macroscopically occupied quantum states. Under appro-
priate conditions [10, 11], the wavefunction of each superconductor can be approximated
q = n1/2
q eiq(t)
where q represents either superconductor 1 or 2, n is the Cooper pair number density


Source: Anderson, Brian P. - Optical Sciences Center, University of Arizona


Collections: Physics