Figure 1: Composite condensates: the distribution of a spherical two-component Bose-Einstein condensate made of 87Rb atoms (red) and 23Na atoms (white), at absolute zero. | Nature

Figure 1: Composite condensates: the distribution of a spherical two-component Bose-Einstein condensate made of 87Rb atoms (red) and 23Na atoms (white), at absolute zero.

From: Superfluids mixing it up

Figure 1

Half of the condensate has been cut away to expose the centre. a, Miscible superfluid of 50,000 rubidium and 50,000 sodium atoms, with a rubidium-sodium scattering length A12 = 1.8 nm. b, Immiscible superfluid, with rubidium atoms inside a shell of sodium atoms; A12 = 9.6 nm. c, As b, but the higher-energy metastable state is shown, with the sodium on the inside. d, As b, but now 200,000 sodium atoms compress 50,000 of rubidium into a far smaller volume. These pictures are from our simulations, with parameters the same as those used by Pu and Bigelow1.

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