Merging of single-particle levels and non-Fermi-liquid behavior of finite Fermi systems

Details Merging of single-particle levels and non-Fermi-liquid behavior of finite Fermi systems Merging of single-particle levels and non-Fermi-liquid behavior of finite Fermi systems

2007-01-05

arxiv.org/abs/cond-mat/0701117v1

Phys. Rev. Lett. 98, 216404 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.98.216404

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.

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