Surface Energy in Cold Asymmetrical Fermion Superfluids

Abstract

We derive the energy of the surface between the normal and superfluid components of a mixed phase of a system composed of two particle species with different densities. The surface energy is obtained by the integration of the free energy density in the interface between the two phases. We show that the mixed phase remains as the favored ground state over the gapless phase in weak coupling. We find that the surface energy effects emerge only at strong coupling.

12 pages, 2 figures, typos corrected, published version

References in corpus (8)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
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• BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
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• The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
• Phase Diagram of Cold Polarized Fermi Gas in Two Dimensions
• Integrable model for density-modulated quantum condensates: solitons passing through a soliton lattice
• Theory of the Normal/Superfluid interface in population imbalanced Fermi gases
• Superfluidity in Two-Dimensional Imbalanced Fermi Gases
• Temperature Effects in a Fermi Gas with Population Imbalance
• Dynamical properties of the unitary Fermi gas: collective modes and shock waves
• Coexistence of topological and nontopological Fermi-superfluid phases
• Leading Order $k_{F}a$ Corrections to the Free Energy and Phase Separation in Two-component Fermion Systems
• The Gor'kov and Melik-Barkhudarov correction to an imbalanced Fermi gas in the presence of impurities