# Five-Body Efimov Effect and Universal Pentamer in Fermionic Mixtures

Abstract : 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.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2017, 118 (8), pp.083002
Domaine :

https://hal.archives-ouvertes.fr/hal-01491300
Contributeur : Claudine Le Vaou <>
Soumis le : jeudi 16 mars 2017 - 15:56:51
Dernière modification le : jeudi 11 janvier 2018 - 06:12:41

### Identifiants

• HAL Id : hal-01491300, version 1
• ARXIV : 1612.09341

### Citation

Betzalel Bazak, Dmitry S. Petrov. Five-Body Efimov Effect and Universal Pentamer in Fermionic Mixtures. Physical Review Letters, American Physical Society, 2017, 118 (8), pp.083002. 〈hal-01491300〉

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