Universality in molecular halo clusters

Abstract

Ground state of weakly bound dimers and trimers with a radius extending well into the classically forbidden region is explored, with the goal to test the predicted universality of quantum halo states. The focus of the study are molecules consisting of T$\downarrow$, D$\downarrow$, ${}^3$He, ${}^4$He and alkali atoms, where interaction between particles is much better known than in the case of nuclei, which are traditional examples of quantum halos. The study of realistic systems is supplemented by model calculations in order to analyze how low-energy properties depend on the interaction potential. The use of variational and diffusion Monte Carlo methods enabled very precise calculation of both size and binding energy of the trimers. In the quantum halo regime, and for large values of scaled binding energies, all clusters follow almost the same universal line. As the scaled binding energy decreases, Borromean states separate from tango trimers.

5 pages, 3 figures, accepted for publication in Phys. Rev. Lett

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Cited by in corpus (9)

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• Cold atom-dimer reaction rates with ${}^4$He, ${}^{6,7}$Li and ${}^{23}$Na
• Extension of the ratio method to low energy
• Quantum halo states in two-dimensional dipolar clusters
• Hyperspherical approach to atom--dimer collision with the Jacobi boundary condition
• Van der Waals five-body size-energy universality
• Quantum Monte Carlo study of few- and many-body Bose systems in one and two dimensions