A new superfluid phase in Fermi matter, termed as ``interior gap'' (IG) or ``breached pair'', has been recently predicted by Liu and Wilczek [Phys. Rev. Lett. 90, 047002 (2003)]. This results from pairing between fermions of two species having essentially different Fermi surfaces. Using a nonperturbative variational approach, we analyze the features, such as energy gap, momentum distributions, and elementary excitations, associated with the predicted phase. We discuss possible realization of this phase in two-component Fermi gases in an optical trap.
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Deb et al. (2004) studied this question.
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