Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Trapped fermion mixtures with unequal masses: a Bogoliubov-de Gennes approach


Menderes Iskin, Carl J. Williams


We use the Bogoliubov-de Gennes formalism to analyze the ground state phases of harmonically trapped two-species fermion mixtures with unequal masses. In the weakly attracting limit and around unitarity we find that the superfluid order parameter modulates spatially around the trap center, and that it's global maximum occurs at a finite distance away from the trap center where the mixture is locally unpolarized. As the attraction strength increases towards the molecular limit, the spatial modulations gradually disappear while the Bardeen-Cooper-Schrieffer (BCS) type nonmodulating superfluid region expands until the entire mixture becomes locally unpolarized.
Physical Review Letters


Fermi-Fermi mixtures, Li-K mixture, superfluid oscillations, Fulde-Ferrell-Larkin-Ovchinnikov superfluidity


Iskin, M. and Williams, C. (1970), Trapped fermion mixtures with unequal masses: a Bogoliubov-de Gennes approach, Physical Review Letters (Accessed May 26, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created August 26, 2016, Updated February 17, 2017