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Speed of sound of a spin balanced Fermi gas with s- and d-wave pairings across the BCS-BEC evolution
Zlatko Koinov, Rafael Mendoza
The authors of a recent paper (PRA \textbf{87}, 013613 (2013)) argued that in fermionic systems with d-wave pairing the speed of sound is nonanalytic across the BCS-BEC crossover a…
Collective modes of a spin-orbit-coupled superfluid Fermi gas in a two-dimensional optical lattice: a comparison between the Gaussian approximation and the Bethe-Salpeter approach
Zlatko Koinov, Rafael Mendoza
A functional integral technique and a Legendre transform are used to give a systematic derivation of the Schwinger-Dyson equations for the generalized single-particle Green's funct…
Anomalous dispersion of the collective modes of an ultracold mixture in a square optical lattice
Zlatko Koinov, Shanna Pahl, Rafael Mendoza
We report numerical calculations of the collective excitation spectrum and the speed of sound of the superfluid phase of an atomic Fermi-Fermi mixture of population-imbalanced Lith…
Low-energy theory of the Nambu-Goldstone modes of an ultracold mixture in an optical lattice
Zlatko Koinov
A low-energy theory of the Nambu-Goldstone excitation spectrum and the corresponding speed of sound of an interacting Fermi mixture of Lithium-6 and Potassium-40 atoms in a two-dim…
One-dimensional Cooper pairing
R. Mendoza, M. Fortes, M. de Llano +1
We study electron pairing in a one-dimensional (1D) fermion gas at zero temperature under zero- and finite-range, attractive, two-body interactions. The binding energy of Cooper pa…