Abstract
The universal three-body dynamics in ultracold binary gases confined to one-dimensional motion is studied. The three-body binding energies and the (2 + 1)-scattering lengths are calculated for two identical particles of mass m and a different particle of mass m 1, whose interaction is described in the low-energy limit by zero-range potentials. The critical values of the mass ratio m/m 1 at which three-body states occur and the (2 + 1)-scattering length vanishes are determined for both zero and infinite interaction strength λ1 of the identical particles. A number of exact results are listed and asymptotic dependences for both m/m 1 → ∞ and λ1 → −∞ are derived. Combining the numerical and analytic results, we deduce a schematic diagram showing the number of three-body bound states and the sign of the (2 + 1)-scattering length in the plane of the mass ratio and the interaction-strength ratio. The results provide a description of the homogeneous and mixed phases of atoms and molecules in dilute binary quantum gases.
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Kartavtsev, O.I., Malykh, A.V. & Sofianos, S.A. Bound states and scattering lengths of three two-component particles with zero-range interactions under one-dimensional confinement. J. Exp. Theor. Phys. 108, 365–373 (2009). https://doi.org/10.1134/S1063776109030017
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DOI: https://doi.org/10.1134/S1063776109030017