Adaptation of the Landau-Migdal quasiparticle pattern to strongly correlated Fermi systems

Journal Article · Thu Sep 15 00:00:00 EDT 2011 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778811090079· OSTI ID:22043859

Khodel, V A ^[1]; Clark, J W ^[2]

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1. Russian Research Centre Kurchatov Institute (Russian Federation)
2. Washington University, McDonnell Center for the Space Sciences and Department of Physics (United States)

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.

• OSTI ID: 22043859
• Journal Information: Physics of Atomic Nuclei, Vol. 74, Issue 9; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7788
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ENERGY-LEVEL DENSITY
EXCITATION
FERMI GAS
FERMI GAS MODEL
FERMI LEVEL
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SINGLE-PARTICLE MODEL
SYMMETRY BREAKING
TEMPERATURE DEPENDENCE