Enhancing the Efimov correlation in Bose polarons with large mass imbalance

Abstract

We study the effect of Efimov physics (in the few-body sector) to the spectral response of Bose polaron, a many-body system consisting of an impurity immersed in a bath of bosonic atoms. We find that the Efimov correlation can be greatly enhanced by increasing the mass ratio between the bosons and the impurity, which results in visible signatures in the rf spectrum of the polaron. Using a diagrammatic approach up to the third-order virial expansion, we show how the mass imbalance and the enhanced three-body effect modify the line shape and the width of the polaron spectrum. Moreover, we study the effect of a finite boson-boson interaction to the spectrum. Taking the realistic system of Li impurities immersed in Cs bosons with a positive Cs-Cs scattering length, we find a visible Efimov branch, which is associated with the second lowest Efimov trimer, in the polaron spectrum. In particular, by adjusting the boson density the Efimov branch can greatly hybridize with the attractive polaron branch leading to the spectrum broadening near their avoided level crossing. Our results can be directly probed in the cold atoms experiments of Li-Cs and Li-Rb Bose polarons.

arXiv comment8 pages, 4 figures

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• From Efimov Physics to the Bose Polaron using Gaussian States
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• High Temperature Virial Expansion to Universal Quench Dynamics
• Three in Many: Efimov physics in the presence of a Fermi sea
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• Polaronic dressing of bound states
• Quench Dynamics of Thermal Bose Gases Across Wide and Narrow Feshbach