Bound states and superconductivity in dense Fermi systems

Journal Article · Mon Dec 15 04:00:00 EST 2008 · Physics of Particles and Nuclei

DOI:https://doi.org/10.1134/S1063779608070071· OSTI ID:22974881

Blaschke, D. ^[1]; Zablocki, D. ^[1]

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1. Instytut Fizyki Teoretycznej, Uniwersytet Wrocławski, Wrocław (Poland)

A quantum field theoretical approach to the thermodynamics of dense Fermi systems is developed for the description of the formation and dissolution of quantum condensates and bound states in dependence of temperature and density. As a model system, we study the chiral and superconducting phase transitions in two-flavor quark matter within the NJL model and their interrelation with the formation of quark-antiquark and diquark bound states. The phase diagram of quark matter is evaluated as a function of the diquark coupling strength and a coexistence region of chiral symmetry breaking, and color superconductivity is obtained at very strong coupling. The crossover between Bose-Einstein condensation (BEC) of diquark bound states and condensation of diquark resonances (Cooper pairs) in the continuum (BCS) is discussed as a Mott effect. This effect consists in the transition of bound states into the continuum of scattering states under the influence of compression and heating. We explain the physics of the Mott transition with special emphasis on the role of the Pauli principle for the case of the pion in quark matter.

• OSTI ID: 22974881
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 7 Vol. 39; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
BOUND STATE
CHIRAL SYMMETRY
COLOR MODEL
COOPER PAIRS
DENSITY
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
QUARK MATTER
QUARK-ANTIQUARK INTERACTIONS
QUARKS
STRONG-COUPLING MODEL
SUPERCONDUCTIVITY
SYMMETRY BREAKING