Abstract
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.
- Received 16 August 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.017001
©2005 American Physical Society