Fermion Condensation and Non Fermi Liquid Behavior in a Model with Long Range Forces
J. Dukelsky, V. A. Khodel, P. Schuck, V. R. Shaginyan
Abstract
The phenomenon of the so called Fermion condensation, a phase transition analogous to Bose condensation but for Fermions, postulated in the past to occur in systems with strong momentum dependent forces, is reanalysed in a model with infinite range interactions. The strongly non Fermi Liquid behavior of this system is demonstrated analytically at T=0 and at T≠ 0 in the superconducting and normal phases. The validity of the quasiparticle picture is investigated and seems to hold true for temperatures less than the characteristic temperature Tf of the Fermion condensation.
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