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#### C_{6} coefficients for interacting Rydberg atoms and alkali-metal dimers

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PhysRevA.101.032705.pdf

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##### Citation

Olaya, V., Pérez-Ríos, J., & Herrera, F. (2020). C_{6} coefficients for
interacting Rydberg atoms and alkali-metal dimers.* Physical Review A,* *101*(3):
032705. doi:10.1103/PhysRevA.101.032705.

Cite as: https://hdl.handle.net/21.11116/0000-0005-F7C7-4

##### Abstract

We study the van der Waals interaction between Rydberg alkali-metal atoms with fine structure (n

^{2}L_{j}; L≤2) and heteronuclear alkali-metal dimers in the ground rovibrational state (X^{1}Σ^{+}; v=0, J=0). We compute the associated C_{6}dispersion coefficients of atom-molecule pairs involving^{133}Cs and^{85}Rb atoms interacting with KRb, LiCs, LiRb, and RbCs molecules. The obtained dispersion coefficients can be accurately fitted to a state-dependent polynomial O(n^{7}) over the range of principal quantum numbers 40≤n≤150. For all atom-molecule pairs considered, Rydberg states n^{2}S_{j}and n^{2}P_{j}result in attractive 1/R^{6}potentials. In contrast, n^{2}D_{j}states can give rise to repulsive potentials for specific atom-molecule pairs. The interaction energy at the LeRoy distance approximately scales as n^{-5}for n>40. For intermediate values of n≲40, both repulsive and attractive interaction energies of the order of 10–1000μK can be achieved with specific atomic and molecular species. The accuracy of the reported C_{6}coefficients is limited by the quality of the atomic quantum defects, with relative errors ΔC_{6}/C_{6}estimated to be no greater than 1% on average.