A Large Atom Number Metastable Helium Bose-Einstein Condensate

Details A Large Atom Number Metastable Helium Bose-Einstein Condensate A Large Atom Number Metastable Helium Bose-Einstein Condensate

2005-09-30

arxiv.org/abs/cond-mat/0510006v2

Phys. Rev. A73, 031603(R) (2006)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures (changed content)

Scientific paper

10.1103/PhysRevA.73.031603

We have produced a Bose-Einstein condensate of metastable helium (4He*) containing over 1.5x10^7 atoms, which is a factor of 25 higher than previously achieved. The improved starting conditions for evaporative cooling are obtained by applying one-dimensional Doppler cooling inside a magnetic trap. The same technique is successfully used to cool the spin-polarized fermionic isotope (3He*), for which thermalizing collisions are highly suppressed. Our detection techniques include absorption imaging, time-of-flight measurements on a microchannel plate detector and ion counting to monitor the formation and decay of the condensate.

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