Adaptation of the Landau-Migdal quasiparticle pattern to strongly correlated Fermi systems |
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Authors: | V A Khodel J W Clark M V Zverev |
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Institution: | 1.Russian Research Centre Kurchatov Institute,Moscow,Russia;2.McDonnell Center for the Space Sciences and Department of Physics,Washington University,Washington,USA;3.Moscow Institute of Physics and Technology,Moscow,Russia |
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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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