[L'effet d'Efimov dans le lithium 6]
Nous analysons les récentes expériences concernant la physique à basse énergie de trois atomes de lithium 6 dans des états internes différents avec des longueurs de diffusion résonantes. Toutes les observations s'expliquent qualitativement par l'effet d'Efimov, c'est-à-dire l'attraction universelle effective à trois corps qui survient aux grandes valeurs des longueurs de diffusion. En revanche, il apparaît qu'une compréhension quantitative nécessite des corrections non-universelles à deux et trois corps provenant du comportement inconnu à courte distance. Nous proposons d'implémenter ces corrections par le biais de paramètres dépendant de l'énergie et ajustés à l'expérience.
We analyse the recent experiments investigating the low-energy physics of three lithium 6 atoms in three different internal states with resonant two-body scattering lengths. All observed features are qualitatively consistent with the expected Efimov effect, i.e. the effective universal three-body attraction that arises for large values of the scattering lengths. However, we find that a quantitative description at negative energy requires non-universal two- and three-body corrections due to presently unknown behaviour at short distance. An attempt to implement these corrections is made through energy-dependent parameters that are fitted to the experimental data.
Accepté le :
Publié le :
Pascal Naidon 1, 2 ; Masahito Ueda 1, 2
@article{CRPHYS_2011__12_1_13_0, author = {Pascal Naidon and Masahito Ueda}, title = {The {Efimov} effect in lithium 6}, journal = {Comptes Rendus. Physique}, pages = {13--26}, publisher = {Elsevier}, volume = {12}, number = {1}, year = {2011}, doi = {10.1016/j.crhy.2010.12.002}, language = {en}, }
Pascal Naidon; Masahito Ueda. The Efimov effect in lithium 6. Comptes Rendus. Physique, Few body problem, Volume 12 (2011) no. 1, pp. 13-26. doi : 10.1016/j.crhy.2010.12.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.12.002/
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