Trimers, molecules, and polarons in mass-imbalanced atomic fermi gases

Charles J.M. Mathy, Meera M. Parish, David A. Huse

Research output: Contribution to journalArticlepeer-review

92 Scopus citations


We consider the ground state of a single "spin-down" impurity atom interacting attractively with a "spin-up" atomic Fermi gas. By constructing variational wave functions for polarons, molecules, and trimers, we perform a detailed study of the transitions between these dressed bound states as a function of mass ratio r=m/m and interaction strength. Crucially, we find that the presence of a Fermi sea enhances the stability of the p-wave trimer, which can be viewed as a Fulde-Ferrell-Larkin- Ovchinnikov molecule that has bound an additional majority atom. For sufficiently large r, we find that the transitions lie outside the region of phase separation of the imbalanced Fermi gas and should thus be observable in experiment, unlike the well-studied equal-mass case.

Original languageEnglish (US)
Article number166404
JournalPhysical review letters
Issue number16
StatePublished - Apr 22 2011

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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