Merging of single-particle levels and non-Fermi-liquid behavior of finite Fermi systems.
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.
Khodel
V A
VA
Russian Research Centre Kurchatov Institute, Moscow, 123182, Russia.
Clark
J W
JW
Li
Haochen
H
Zverev
M V
MV