Long-range potentials and $(n-1)d+ns$ molecular resonances in an ultracold rydberg gas

Abstract

We have calculated long-range molecular potentials of the $0_g^{+}$, $0_u^{-}$ and $1_u$ symmetries between highly-excited rubidium atoms. Strong $np+np$ potentials characterized by these symmetries are important in describing interaction-induced phenomena in the excitation spectra of high $np$ Rydberg states. Long-range molecular resonances are such phenomena and they were first reported in S.M. Farooqi {\it et al.}, Phys. Rev. Lett. {\bf 91} 183002. One class of these resonances occurs at energies corresponding to excited atom pairs $(n-1)d+ns$. Such resonances are attributed to $\ell$-mixing due to Rydberg-Rydberg interactions so that otherwise forbidden molecular transitions become allowed. We calculate molecular potentials in Hund's case (c), use them to find the resonance lineshape and compare to experimental results.

11 pages, 7 figures

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• Quantum computing with collective ensembles of multi-level systems
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Cited by in corpus (5)

• Observation of dipole-quadrupole interaction in an ultracold gas of Rydberg atoms
• Rydberg Macrodimers: Diatomic molecules on the micrometer scale
• Van der Waals interaction potential between Rydberg atoms near surfaces
• Long-range interactions between rubidium and potassium Rydberg atoms
• Phase-amplitude formalism for ultra-narrow shape resonances