Stability criteria for breached-pair superfluidity.
We present simple, concrete, two-fermion models that exhibit thermodynamically stable isotropic translationally invariant gapless superfluid states (breached-pair superfluidity). The mass ratio between the components and the momentum structure of the interaction are crucial for determining the stability of such states: idealized, momentum-independent ("contact") interactions are insufficient.
Forbes
Michael McNeil
MM
Center for Theoretical Physics, Department of Physics, MIT, Cambridge, MA 02139, USA.
Gubankova
Elena
E
Liu
W Vincent
WV
Wilczek
Frank
F