arXiv:hep-ph/0405059·v2·High Energy Physics — Phenomenology
Stability Criteria for Breached Pair Superfluidity
Michael McNeil Forbes🇺🇸 · Elena Gubankova🇺🇸 · W. Vincent Liu🇺🇸 · Frank Wilczek🇺🇸
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.
Comments: 5 pages, REVTeX4. Minor updates in response to comments. References added