Observation of a Strong Atom-Dimer Attraction in a Mass-Imbalanced Fermi-Fermi Mixture
Quantum Gases
2014-03-05 v3
Abstract
We investigate a mixture of ultracold fermionic K atoms and weakly bound LiK dimers on the repulsive side of a heteronuclear atomic Feshbach resonance. By radio-frequency spectroscopy we demonstrate that the normally repulsive atom-dimer interaction is turned into a strong attraction. The phenomenon can be understood as a three-body effect in which two heavy K fermions exchange the light Li atom, leading to attraction in odd partial-wave channels (mainly p-wave). Our observations show that mass imbalance in a fermionic system can profoundly change the character of interactions as compared to the well-established mass-balanced case.
Keywords
Cite
@article{arxiv.1311.5146,
title = {Observation of a Strong Atom-Dimer Attraction in a Mass-Imbalanced Fermi-Fermi Mixture},
author = {Michael Jag and Matteo Zaccanti and Marko Cetina and Rianne S. Lous and Florian Schreck and Rudolf Grimm and Dmitry S. Petrov and Jesper Levinsen},
journal= {arXiv preprint arXiv:1311.5146},
year = {2014}
}