Macrodimers: ultralong range Rydberg molecules

Abstract

We study long range interactions between two Rydberg atoms and predict the existence of ultralong range Rydberg dimers with equilibrium distances of many thousand Bohr radii. We calculate the dispersion coefficients $C_5$, $C_6$ and $C_8$ for two rubidium atoms in the same excited level $np$, and find that they scale like $n^8$, $n^{11}$ and $n^{15}$, respectively. We show that for certain molecular symmetries, these coefficients lead to long range potential wells that can support molecular bound levels. Such macrodimers would be very sensitive to their environment, and could probe weak interactions. We suggest experiments to detect these macrodimers.

4 pages, submitted to PRL

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