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Fermion condensation and non Fermi liquid behavior in a model with long range forces |
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| Authors: | J Dukelsky VA Khodel P Schuck VR Shaginyan |
| Institution: | 1. Instituto de Estructura de la Materia, Serrano 123, E-28006, Madrid, Spain 2. Kurchatov Institute of Atomic Energy, Moscow, 123182, Russian Federation 3. Institut des Sciences Nucléaires, CNRS-IN2P3 Université Joseph Fourier, 53 Avenue des Martyrs, F-38026, Grenoble Cedex, France 4. St. Petersburg Nuclear Physics Institute, Gatchina, 188350, Russian Federation |
| 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 reanalyzed 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 seen to hold true for temperatures less than the characteristic temperature T f of the Fermion condensation. |
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