Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.053001
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [PF 381/13-1, SFB/TRR21]
- ERC [267100]
- DFG [HO 4787/1-1]
- Studienstiftung des deutschen Volkes
- Carl Zeiss Foundation
- NSF [PHY-130690]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1306905] Funding Source: National Science Foundation
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We present spectroscopy of a single Rydberg atom excited within a Bose-Einstein condensate. We not only observe the density shift as discovered by Amaldi and Segre in 1934, but a line shape that changes with the principal quantum number n. The line broadening depends precisely on the interaction potential energy curves of the Rydberg electron with the neutral atom perturbers. In particular, we show the relevance of the triplet p-wave shape resonance in the e(-)-Rb(5S) scattering, which significantly modifies the interaction potential. With a peak density of 5.5 x 10(14) cm(-3), and therefore an interparticle spacing of 1300 a(0) within a Bose-Einstein condensate, the potential energy curves can be probed at these Rydberg ion-neutral atom separations. We present a simple microscopic model for the spectroscopic line shape by treating the atoms overlapped with the Rydberg orbit as zero-velocity, uncorrelated, pointlike particles, with binding energies associated with their ion-neutral separation, and good agreement is found.
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