# Speed of Sound of a Spin-Balanced Fermi Gas with s- and d-Wave Pairings Across the BCS–BEC Evolution

@article{Koinov2016SpeedOS,
title={Speed of Sound of a Spin-Balanced Fermi Gas with s- and d-Wave Pairings Across the BCS–BEC Evolution},
author={Z. Koinov and R. Mendoza},
journal={Journal of Low Temperature Physics},
year={2016},
volume={184},
pages={1042-1053}
}
• Published 2016
• Physics
• Journal of Low Temperature Physics
The authors of a recent paper (Phys Rev A 87:013613, 2013) argued that in fermionic systems with d-wave pairing the speed of sound is nonanalytic across the BCS–BEC crossover at the point where the chemical potential vanishes, regardless of the specific details of the interaction potential. On the contrary, the numerical results reported here suggest that the speed of sound across the BCS–BEC evolution of atomic Fermi gases with s- and d-wave pairings in two-dimensional square lattices is a… Expand

#### References

SHOWING 1-10 OF 13 REFERENCES
Speed of sound in an optical lattice
A system of equal mixture of 6Li atomic Fermi gas of two hyperfine states loaded into a cubic three-dimensional optical lattice is studied assuming a negative scattering length (BCS side of theExpand
Instability of superfluid Fermi gases induced by a rotonlike density mode in optical lattices
• Physics
• 2009
We study the stability of superfluid Fermi gases in deep optical lattices in the BCS\char21{}Bose-Einstein condensation (BEC) crossover at zero temperature. Within the tight-binding attractiveExpand
Cooper-pair-condensate fluctuations and plasmons in layered superconductors.
• Physics, Medicine
• Physical review. B, Condensed matter
• 1993
A comlete normal-mode analysis is given for a charged BCSsuperconductor, showing how the repulsive (Coulomb) interaction modifies the collective modes of a neutral superconductor. Expand
BCS-BEC quantum phase transition and collective excitations in two-dimensional Fermi gases with p- and d-wave pairings
• Physics
• 2013
It is generally believed that the BCS-BEC evolution in fermionic systems with $s$-wave pairing is a smooth crossover. However, for nonzero orbital-angular-momentum pairing such as $p$- or $d$-waveExpand
Weak-coupling theory of photoemission and inelastic neutron scattering and the mechanism of superconductivity in the cuprates
• Physics
• 2008
Extensive ARPES and low-energy inelastic neutron scattering studies of cuprate superconductors can be successfully described using a weak-coupling theory in which quasiparticles on a square latticeExpand
Relation of neutron incommensurability to electronic structure in high-temperature superconductors
The relation between the incommensurability observed in neutron scattering experiments in bilayer cuprate superconductors and the electronic structure is investigated. It is found that the observedExpand
Superconductivity in narrow-band systems with local nonretarded attractive interactions
• Physics
• 1990
In narrow-band systems electrons can interact with each other via a short-range nonretarded attractive potential. The origin of such an effective local attraction can be polaronic or it can be due toExpand
Bethe-Salpeter equations for the collective modes of the $t-U-V-J$ model with d-wave pairing
• Physics
• 2010
The Bethe-Salpeter equations for the collective modes of a $t$-$U$-$V$-$J$ model are used to analyze the resonance peak observed at $\bf{Q}=(\pi,\pi)$ in neutron scattering experiments on theExpand
The t‐U‐V‐J model in cuprates: Strengths of the interactions
The t-U-V-J model fits together three major parts of the superconductivity puzzle of the cuprite compounds: (i) it describes the opening of a d-wave pairing gap, (ii) it is consistent with the factExpand
Superconductivity near phase separation in models of correlated electrons.
• Dagotto, +4 authors Ortolani
• Physics, Medicine
• Physical review. B, Condensed matter
• 1994
Numerical and analytical studies of several models of correlated electrons are discussed. Based on exact diagonalization and variational Monte Carlo techniques, we have found indications that theExpand