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Three-body rf association of Efimov trimers
We present a theoretical analysis of rf association of Efimov trimers in a
2-component Bose gas with short-range interactions. Using the adiabatic
hyperspherical Green's function formalism to solve the quantum 3-body problem,
we obtain universal expressions for 3-body rf association rates as a function
of the s-wave scattering length . We find that the association rates scale
as in the limit of large , and diverge as whenever
an Efimov state crosses the atom-dimer threshold (where stands for the
atom-dimer scattering length). Our calculations show that trimer formation
rates as large as cm/s can be achieved with rf Rabi
frequencies of order 1 MHz, suggesting that direct rf association is a powerful
tool of making and probing few-body quantum states in ultracold atomic gases.Comment: 4 pages, 2 figure