  We consider a two-component atomic Fermi gas within a mean-field,
single-channel model, where both the mass and population of each component are
unequal. We show that the tricritical point at zero temperature evolves
smoothly from the BEC- to BCS-side of the resonance as a function of mass ratio
r. We find that the interior gap state proposed by Liu and Wilczek is always
unstable to phase separation, while the breached pair state with one Fermi
surface for the excess fermions exhibits differences in its DoSs and pair
correlation functions depending on which side of the resonance it lies.
Finally, we show that, when r > 3.95, the finite temperature phase diagram of
trapped gases at unitarity becomes topologically distinct from the equal mass
system.
