3 years ago

Creation of Rydberg Polarons in a Bose Gas.

S. Yoshida, G. Woehl Jr., H. R. Sadeghpour, T. C. Killian, J. Burgdörfer, R. Ding, F. Camargo, R. Schmidt, F. B. Dunning, J. D. Whalen, E. Demler

We report spectroscopic observation of Rydberg polarons in an atomic Bose gas. Polarons are created by excitation of Rydberg atoms as impurities in a strontium Bose-Einstein condensate. They are distinguished from previously studied polarons by macroscopic occupation of bound molecular states that arise from scattering of the weakly bound Rydberg electron from ground-state atoms. The absence of a $p$-wave resonance in the low-energy electron-atom scattering in Sr introduces a universal behavior in the Rydberg spectral lineshape and in scaling of the spectral width (narrowing) with the Rydberg principal quantum number, $n$. Spectral features are described with a functional determinant approach (FDA) that solves an extended Fr\"{o}hlich Hamiltonian for a mobile impurity in a Bose gas. Excited states of polyatomic Rydberg molecules (trimers, tetrameters, and pentamers) are experimentally resolved and accurately reproduced with FDA.

Publisher URL: http://arxiv.org/abs/1706.03717

DOI: arXiv:1706.03717v4

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