Pairing fluctuation effects in a strongly coupled color superfluid/superconductor
arXiv:1211.1225 · doi:10.1103/PhysRevD.88.054017
Abstract
We investigate the effects of pairing fluctuations in fermionic superfluids/superconductors where pairing occurs among three species (colors) of fermions. Such color superfluids/superconductors can be realized in three-component atomic Fermi gases and in dense quark matter. The superfluidity/superconductivity is characterized by a three-component order parameter which denotes the pairing among the three colors of fermions. Due to the SU symmetry of the Hamiltonian, one color does not participate pairing. This branch of fermionic excitation is gapless in the naive BCS mean-field description. In this paper, we adopt a pairing-fluctuation theory to investigate the pairing fluctuation effects on the unpaired color in strongly coupled atomic color superfluids and quark color superconductors. At low temperature, a large pairing gap of the paired colors suppresses the pairing fluctuation effects for the unpaired color, and the spectral density of the unpaired color shows a single Fermi-liquid peak, which indicates the naive mean-field picture remains valid. As the temperature is increased, the spectral density of the unpaired color generally exhibits a three-peak structure: the Fermi-liquid peak remains but get suppressed, and two pseudogap-like peaks appears. At and above the superfluid transition temperature, the Fermi-liquid peak disappears completely and the all three colors exhibits pseudogap-like spectral density. The coexistence of Fermi liquid and pseudogap behavior is generic for both atomic color superfluids and quark color superconductors.
V3: Published version
References in corpus (32)
- Color superconductivity in dense quark matter
- Ultracold fermions and the SU(N) Hubbard model
- Observation of pseudogap behavior in a strongly interacting Fermi gas
- Three-body recombination in a three-state Fermi gas with widely tunable interactions
- Color Superfluidity and "Baryon" Formation in Ultracold Fermions
- Two lectures on color superconductivity
- Equation of state of a superfluid Fermi gas in the BCS-BEC crossover
- BEC-BCS Crossover in the Nambu--Jona-Lasinio Model of QCD
- Chromomagnetic instability in dense quark matter
- BCS-BEC crossover at finite temperature in the broken-symmetry phase
- Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas
- BCS pairing in Fermi systems with several flavors
- Pseudo-gap pairing in ultracold Fermi atoms
- Pairing in a three component Fermi gas
- BCS/BEC crossover in Quark Matter and Evolution of its Static and Dynamic properties
- Comparative study of strong coupling theories of a trapped Fermi gas at unitarity
- Superfluidity in a Three-flavor Fermi Gas with SU(3) Symmetry
- Nambu-Jona-Lasinio model description of weakly interacting Bose condensate and BEC-BCS crossover in dense QCD-like theories
- Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions
- Three-Component Fermi Gas in a one-dimensional Optical Lattice
- Relativistic BCS-BEC crossover in a boson-fermion model
- New type of crossover physics in three-component Fermi gases
- Bound diquarks and their Bose-Einstein condensation in strongly coupled quark matter
- Relativistic BCS-BEC Crossover at Zero Temperature
- Multi-component strongly attractive Fermi gas: a color superconductor in a one-dimensional harmonic trap
- Relativistic BCS-BEC Crossover at Finite Temperature and Its Application to Color Superconductivity
- BCS-BEC crossover in dense relativistic matter: Collective excitations
- Role of two-flavor color superconductor pairing in a three-flavor Nambu--Jona-Lasinio model with axial anomaly
- Phase diagram, extended domain walls, and soft collective modes in a three component fermionic superfluid
- Instability of a gapless color superconductor with respect to inhomogeneous fluctuations
- BCS-BEC crossover in a relativistic boson-fermion model beyond mean field approximation
- BCS BEC crossover and phase structure of relativistic system: a variational approach