Pair condensation and bound states in fermionic systems

Details Pair condensation and bound states in fermionic systems Pair condensation and bound states in fermionic systems

2005-11-28

arxiv.org/abs/nucl-th/0511076v2

Phys.Rev.C73:035803,2006

Physics

Nuclear Physics

Nuclear Theory

11 pages, 4 figures, uses RevTex; v2: 12 pages, 4 figures, matches published version

Scientific paper

10.1103/PhysRevC.73.035803

We study the finite temperature-density phase diagram of an attractive fermionic system that supports two-body (dimer) and three-body (trimer) bound states in free space. Using interactions characteristic for nuclear systems, we obtain the critical temperature T_c2 for the superfluid phase transition and the limiting temperature T_c3 for the extinction of trimers. The phase diagram features a Cooper-pair condensate in the high-density, low-temperature domain which, with decreasing density, crosses over to a Bose condensate of strongly bound dimers. The high-temperature, low-density domain is populated by trimers whose binding energy decreases toward the density-temperature domain occupied by the superfluid and vanishes at a critical temperature T_c3 > T_c2.

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