Abstract
A quasiparticle pattern advanced in Landau’s first article on Fermi-liquid theory is adapted to elucidate the properties of a class of strongly correlated Fermi systems characterized by a Lifshitz phase diagram featuring a quantum critical point (QCP) where the density of states diverges. The necessary condition for stability of the Landau Fermi-Liquid state is shown to break down in such systems, triggering a cascade of topological phase transitions that lead, without symmetry violation, to states with multi-connected Fermi surfaces. The end point of this evolution is found to be an exceptional state whose spectrum of single-particle excitations exhibits a completely flat portion at zero temperature. Analysis of the evolution of the temperature dependence of the single-particle spectrum yields results that provide a natural explanation of classical behavior of this class of Fermi systems in the QCP region.
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Khodel, V.A., Clark, J.W. & Zverev, M.V. Adaptation of the Landau-Migdal quasiparticle pattern to strongly correlated Fermi systems. Phys. Atom. Nuclei 74, 1237–1266 (2011). https://doi.org/10.1134/S1063778811090079
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DOI: https://doi.org/10.1134/S1063778811090079