Metastability range of the Bose condensate in 7Li-fermion mixtures at T = 0
Istituto Nazionale di Fisica della Materia and Classe di Scienze, Scuola
Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
Revised: 21 June 1999
Published online: 15 January 2000
We evaluate the ground state of a mixture of bosons and spin-polarized fermions in the case of attractive boson-boson interactions, using a variational Ansatz for the Bose condensate wave function and the Thomas-Fermi approximation for the fermions in the mean field of the condensate. Within this approximation we show that the presence of the fermions tends to restrict the metastability range of the condensate, irrespectively of the sign of the boson-fermion interactions. Numerical illustrations are reported for mixtures of 7Li atoms with fermions having the 6Li mass.
PACS: 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena / 67.40.Db – Quantum statistical theory; ground state, elementary excitations
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000