arXiv:1007.2690 · Physical Review A

Controlling phase separation of binary Bose-Einstein condensates via mixed-spin-channel Feshbach resonance

賢東條, Yoshihisa Taguchi, Y. MASUYAMA, Tarō Hayashi, Hiroki Saito, Takuya Hirano

Published Sep 14, 2010• 201 citations

Abstract

We investigate controlled phase separation of a binary Bose-Einstein condensate in the proximity of a mixed-spin-channel Feshbach resonance in the $|F=1,{m}_{F}=+1\ensuremath{\rangle}$ and $|F=2,{m}_{F}=\ensuremath{-}1\ensuremath{\rangle}$ states of $^{87}\mathrm{Rb}$ at a magnetic field of 9.10 G. Phase separation occurs on the lower-magnetic-field side of the Feshbach resonance while the two components overlap on the higher-magnetic-field side. The Feshbach resonance curve of the scattering length is obtained from the shape of the atomic cloud by comparison with the numerical analysis of coupled Gross-Pitaevskii equations.

DOI: 10.1103/physreva.82.033609

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arXiv:1007.2690 · Physical Review A

Controlling phase separation of binary Bose-Einstein condensates via mixed-spin-channel Feshbach resonance

賢東條, Yoshihisa Taguchi, Y. MASUYAMA, Tarō Hayashi, Hiroki Saito, Takuya Hirano

Published Sep 14, 2010• 201 citations

arXiv HTML PDF

Abstract

We investigate controlled phase separation of a binary Bose-Einstein condensate in the proximity of a mixed-spin-channel Feshbach resonance in the

|F=1,{m}_{F}=+1\ensuremath{\rangle}

and

|F=2,{m}_{F}=\ensuremath{-}1\ensuremath{\rangle}

states of

^{87}\mathrm{Rb}

at a magnetic field of 9.10 G. Phase separation occurs on the lower-magnetic-field side of the Feshbach resonance while the two components overlap on the higher-magnetic-field side. The Feshbach resonance curve of the scattering length is obtained from the shape of the atomic cloud by comparison with the numerical analysis of coupled Gross-Pitaevskii equations.

DOI: 10.1103/physreva.82.033609

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Physical Review LettersMar 9, 1998108 citations

We investigate controlled phase separation of a binary Bose-Einstein condensate in the proximity of a mixed-spin-channel Feshbach resonance in the

|F=1,{m}_{F}=+1\ensuremath{\rangle}

and

|F=2,{m}_{F}=\ensuremath{-}1\ensuremath{\rangle}

states of

^{87}\mathrm{Rb}

We calculate binary collision parameters for mixtures of ultracold gases of

{}^{85}\mathrm{Rb}

and

{}^{87}\mathrm{Rb}

atoms. We predict a large positive triplet scattering length for mixed-isotope collisions, which implies that a stable mixed-isotope double condensate can be formed by sympathetic evaporative cooling. Moreover, collisions between

{}^{85}\mathrm{Rb}

and

{}^{87}\mathrm{Rb}

atoms in the lowest hyperfine manifold exhibit magnetic-field-induced Feshbach resonances which should allow partial control of the interaction between condensates. These considerations make Rb an ideal system for the study of interpenetrating bosonic superfluids.