FIG. 12.1 (a) Scattering lengths and the imbalance parameter, δ a [see Eq. ( 12.1 )] vs the magnetic field, B, which affects the setup through the Feshbach resonance. (b) The evolution of the binary condensates displayed by means of in situ images taken at different times t. (Top) The expansion of a gaseous mixture at B = 56.935 G and δ a = 1.2 a 0 > 0 . (Middle) The formation of a self-trapped droplet in the binary condensate at B = 56.574 G and δ a = − 3.2 a 0 < 0 . (Bottom) The collapse of a single-component state |↓〉 in the attractive condensate at B = 42.281 G and a = −2.06(2)a₀ < 0. (c) The radial size of the mixture, σ r (top), and peak density, n₀ (bottom), as functions of the number of atoms, N. (d) The dependence of σ r on N for different magnetic fields B, corresponding to the transition from strong to weak attraction (top to bottom) ( Cabrera et al., 2018 ). More about this image found in (a) Scattering lengths and the imbalance parameter, δ a [see Eq. ( 1...