C_{6} coefficients for interacting Rydberg atoms and alkalimetal dimers
Abstract
We study the van der Waals interaction between Rydberg alkalimetal atoms with fine structure (n^{2}L_{j} ; L ≤2 ) and heteronuclear alkalimetal dimers in the ground rovibrational state (X ^{+1}Σ ; v =0 , J =0 ). We compute the associated C_{6} dispersion coefficients of atommolecule 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 statedependent polynomial O (n^{7}) over the range of principal quantum numbers 40 ≤n ≤150 . For all atommolecule pairs considered, Rydberg states n ^{S}2_{j} and n ^{P}2_{j} result in attractive 1 /R^{6} potentials. In contrast, n ^{D}2_{j} states can give rise to repulsive potentials for specific atommolecule 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 101000 μ K 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 Δ C_{6}/C_{6} estimated to be no greater than 1% on average.
 Publication:

Physical Review A
 Pub Date:
 March 2020
 DOI:
 10.1103/PhysRevA.101.032705
 arXiv:
 arXiv:1912.01568
 Bibcode:
 2020PhRvA.101c2705O
 Keywords:

 Physics  Atomic Physics
 EPrint:
 14 pages, 7 figures, 2 tables. SM available upon request