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.

Trap-Imbalanced Fermion Mixtures



Menderes Iskin, Carl J. Williams


We analyze the ground state phases of two-component population- andmass-balanced but trap-imbalanced fermion mixtures as a function of interactionstrength from the weak attraction Bardeen-Cooper-Schrieffer (BCS) to the strongattraction Bose-Einstein condensation (BEC) limit. In the BCS limit, we findthat the unpolarized superfluid (UPS) fermions exist away from the central coreof the trapping potentials, and are surrounded by partially polarized normal(PPN) fermions. As the interactions increase towards unitarity, we find that thecentral PPN core first transitions to a UPS, and then expands towards the edgesuntil the entire mixture becomes a UPS in the BEC limit.
Physical Review A (Atomic, Molecular and Optical Physics)


Bardeen-Cooper-Schrieffer Superfluidity, BCS-BEC crossover, Bose-Einstein condensation, Fulde-Ferrell-Larkin-Ovchinnikov phase


Iskin, M. and Williams, C. (2008), Trap-Imbalanced Fermion Mixtures, Physical Review A (Atomic, Molecular and Optical Physics), [online], (Accessed April 13, 2024)
Created January 7, 2008, Updated February 17, 2017