Merging of Single-Particle Levels and Non-Fermi-Liquid Behavior of Finite Fermi Systems

Journal Article · Fri May 25 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.216404· OSTI ID:20951403

Khodel, V A ^[1]; Clark, J W; Haochen, Li ^[2]; Zverev, M V ^[1]

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1. Russian Research Centre Kurchatov Institute, Moscow, 123182 (Russian Federation)
2. McDonnell Center for the Space Sciences and Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)

We examine the problem of finite Fermi systems having a degenerate single-particle spectrum and show that the Landau approach, applied to such a system, admits the possibility of merging single-particle levels. It is demonstrated that the opportunity for this behavior is widespread in quantum many-body systems. The salient feature of the phenomenon is the occurrence of nonintegral quasiparticle occupation numbers, leading to a radical alteration of the standard quasiparticle picture. Implications of this alteration are considered for nuclear, atomic, and solid-state systems.

• OSTI ID: 20951403
• Journal Information: Physical Review Letters, Vol. 98, Issue 21; Other Information: DOI: 10.1103/PhysRevLett.98.216404; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
FERMI GAS
MANY-BODY PROBLEM
PARTICLES
SOLIDS
SPECTRA