Five-Body Efimov Effect and Universal Pentamer in Fermionic Mixtures

B. Bazak, D. S. Petrov

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29 Scopus citations


We show that four heavy fermions interacting resonantly with a lighter atom (4+1 system) become Efimovian at mass ratio 13.279(2), which is smaller than the corresponding 2+1 and 3+1 thresholds. We thus predict the five-body Efimov effect for this system in the regime where any of its subsystem is non-Efimovian. For smaller mass ratios we show the existence and calculate the energy of a universal 4+1 pentamer state, which continues the series of the 2+1 trimer predicted by Kartavtsev and Malykh and 3+1 tetramer discovered by Blume. We also show that the effective-range correction for the light-heavy interaction has a strong effect on all these states and larger effective ranges increase their tendency to bind.

Original languageAmerican English
Article number083002
JournalPhysical Review Letters
Issue number8
StatePublished - 23 Feb 2017
Externally publishedYes

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Publisher Copyright:
© 2017 American Physical Society.


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