Four-particle condensate in strongly coupled fermion systems

Details Four-particle condensate in strongly coupled fermion systems Four-particle condensate in strongly coupled fermion systems

1998-03-26

arxiv.org/abs/cond-mat/9803325v1

Phys.Rev.Lett.80:3177-3180,1998

Physics

Condensed Matter

Strongly Correlated Electrons

LaTeX, 11 pages, 2 figures, uses psfig.sty (included), to be published in Phys. Rev. Lett., tentatively scheduled for 13 April

Scientific paper

10.1103/PhysRevLett.80.3177

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. Within a model calculation for symmetric nuclear matter, we find that below a critical density, the four-particle condensation (alpha-like quartetting) is favored over deuteron condensation (triplet pairing). This pairing-quartetting competition is expected to be a general feature of interacting fermion systems, such as the excition-biexciton system in excited semiconductors. Possible experimental consequences are pointed out.

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