For , even though there is no two-body bound state (dimer), more and more three-body bound states (trimers) are formed as the potential becomes more attractive. The solid lines represent the Efimov trimer states which emerge for and . For on the right, the trimers break up at the atom-dimer continuum, indicated by the dotted curve. Adapted from Fig. 1 of Ref. 16.
A schematic illustration of the relative coordinates used in the three-body problem. See the text for details.
The effective potential between the two heavy-mass particles that arises in the adiabatic approximation due to interaction with the light-mass particle. For , the interatomic potential is irrelevant for the Efimov effect. The scattering length is denoted by the horizontal axis. As , the two-body binding goes to zero and for all . The four regions of the potential are discussed in the text.
The solid circles are experimental data points (Ref. 5) at 10 nK for the observed three-body recombination: . The scattering length is measured in units of the Bohr radius . Adapted from Fig. 2 of Ref. 37.
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