Visualizing Efimov Correlations in the Bose Polaron

Abstract

The Bose polaron is a quasi-particle of an impurity dressed by surrounding bosons. In few-body physics, it is known that two identical bosons and a third distinguishable particle can form a sequence of Efimov bound states in the vicinity of inter-species scattering resonance. On the other hand, in the Bose polaron system with an impurity atom embedded in many bosons, no signature of Efimov physics has been reported in the existing spectroscopy measurements up to date. In this work, we propose that a large mass imbalance between a light impurity and heavy bosons can help produce visible signatures of Efimov physics in such a spectroscopy measurement. Using the diagrammatic approach in the Virial expansion to include three-body effects from pair-wise interactions, we determine the impurity self-energy and its spectral function. Taking ${}^6$Li-${}^{133}$Cs\ system as a concrete example, we find two visible Efimov branches in the polaron spectrum, as well as their hybridizations with the attractive polaron branch. We also discuss the general scenarios for observing the signature of Efimov physics in polaron systems. This work paves the way for experimentally exploring intriguing few-body correlations in a many-body system in the near future.

6 pages, 4 figures; accepted version by PRL

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Cited by in corpus (67)

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• Universality of an impurity in a Bose-Einstein condensate
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• Breathing modes of repulsive polarons in Bose-Bose mixtures
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• High Temperature Virial Expansion to Universal Quench Dynamics
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• Temperature-induced miscibility of impurities in trapped Bose gases
• An experimental platform for studying the heteronuclear Efimov effect with an ultracold mixture of ${}^6$Li and ${}^{133}$Cs atoms
• Repulsive Fermi and Bose Polarons in Quantum Gases
• Energetics and structural properties of two- and three-boson systems in the presence of 1D spin-orbit coupling
• Polaronic dressing of bound states
• Quench Dynamics of Thermal Bose Gases Across Wide and Narrow Feshbach
• Magnetic monopole induced polarons in atomic superlattices
• Efimov energy level rebounding off the atom-dimer continuum
• Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
• Competition of light- and phonon-dressing in microwave-dressed Bose polarons
• Reliability of the Born-Oppenheimer approximation in noninteger dimensions