%0 Journal Article
%T Controlling the interactions of a few cold Rb Rydberg atoms by radiofrequency-assisted F£¿rster resonances
%A D. B. Tretyakov
%A V. M. Entin
%A E. A. Yakshina
%A I. I. Beterov
%A C. Andreeva
%A I. I. Ryabtsev
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevA.90.041403
%X Long-range interactions between cold Rydberg atoms, which are used in many important applications, can be enhanced using F\"orster resonances between collective many-body states controlled by an external electric field. Here we report on the first experimental observation of highly-resolved radio-frequency-assisted F\"orster resonances in a few cold Rb Rydberg atoms. We also observed radio-frequency-induced F\"orster resonances which cannot be tuned by a dc electric field. They imply an efficient transition from van der Waals to resonant dipole-dipole interaction due to Floquet sidebands of Rydberg levels appearing in the rf-field. This method can be applied to enhance the interactions of almost arbitrary Rydberg atoms with large principal quantum numbers.
%U http://arxiv.org/abs/1404.0438v2