Phase separation and response of 3He-4He mixtures within a magnetic trap

P. CAPUZZI AND E. S. HERNÁNDEZ

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

Año: 2002 vol. 66 p. 35602 - 356024

1050-2947

We analyze the collective excitations of a mixture of fermionic and bosonic helium atoms in a random-phase approximation. The spectrum is shown to be highly fragmented, and its spread increases with the size of the Bose-Einstein condensate formed by 4 He atoms. In addition, the phase separation of the components at high boson numbers alters substantially the distribution of excited states. We also study the corresponding fluctua- tion shapes and emphasize their connection with the separation.