Fermions meet two bosons -- the heteronuclear Efimov effect revisited

Abstract

In this article, we revisit the heteronuclear Efimov effect in a Bose-Fermi mixture with large mass difference in the Born-Oppenheimer picture. As a specific example, we consider the combination of bosonic ${}^{133}\mathrm{Cs}$ and fermionic ${}^6\mathrm{Li}$. In a system consisting of two heavy bosons and one light fermion, the fermion-mediated potential between the two heavy bosons gives rise to an infinite series of three-body bound states. The intraspecies scattering length determines the three-body parameter and the scaling factor between consecutive Efimov states. In a second scenario, we replace the single fermion by an entire Fermi Sea at zero temperature. The emerging interaction potential for the two bosons exhibits long-range oscillations leading to a weakening of the binding and a breakup of the infinite series of Efimov states. In this scenario, the binding energies follow a modified Efimov scaling law incorporating the Fermi momentum. The scaling factor between deeply bound states is governed by the intraspecies interaction, analogous to the Efimov states in vacuum.

arXiv comment8 pages, 5 figures

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Cited by in corpus (5)

• Scattering of two heavy Fermi polarons: resonances and quasibound states
• Medium-induced Interaction Between Impurities in a Bose-Einstein Condensate
• Efimov resonance position near a narrow Feshbach resonance in ${}^6$Li-${}^{133}$Cs mixture
• Interferometry of Efimov states in thermal gases by modulated magnetic fields
• Universal Efimov Scaling in the Rabi-Coupled Few-Body Spectrum