Quasipure Bose-Einstein condensate immersed in a Fermi sea.
We report the observation of coexisting Bose-Einstein condensate (BEC) and Fermi gas in a magnetic trap. With a very small fraction of thermal atoms, the 7Li condensate is quasipure and in thermal contact with a 6Li Fermi gas. The lowest common temperature is 0.28 microK approximately 0.2(1)T(C) = 0.2(1)T(F) where T(C) is the BEC critical temperature and T(F) the Fermi temperature. The 7Li condensate has a one-dimensional character.
Schreck
F
F
Laboratoire Kastler Brossel, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris CEDEX 05, France.
Khaykovich
L
L
Corwin
K L
KL
Ferrari
G
G
Bourdel
T
T
Cubizolles
J
J
Salomon
C
C