FOUR-PARTICLE CONDENSATE IN STRONGLY COUPLED FERMION SYSTEMS

@article{Roepke1998FOURPARTICLECI,
  title={FOUR-PARTICLE CONDENSATE IN STRONGLY COUPLED FERMION SYSTEMS},
  author={Gerd Roepke and A. Schnell and Peter Schuck and Philippe Nozi{\`e}res},
  journal={Physical Review Letters},
  year={1998},
  volume={80},
  pages={3177-3180}
}
Four-particle correlations in fermion systems at finite temperatures are investigated with special attention to the formation of a condensate. Instead of the instability of the normal state with respect to the onset of pairing described by the Gorkov equation, a new equation is obtained which describes the onset of ``quartetting.'' Applying to symmetric nuclear matter, below a critical density, the four-particle condensation ( $\ensuremath{\alpha}$-like quartetting) is found to be favored over… Expand

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