THE SURPRISING PHENOMENON OF LEVEL MERGING IN FINITE FERMI SYSTEMS
2008 ◽
Vol 22
(25n26)
◽
pp. 4452-4463
Keyword(s):
When applied to a finite Fermi system having a degenerate single-particle spectrum, the Landau-Migdal Fermi-liquid approach leaves room for the possibility that different single-particle energy levels merge with one another. It will be argued that the opportunity for this behavior exists over a wide range of strongly interacting quantum many-body systems. An inherent feature of the mergence phenomenon is the presence of nonintegral quasiparticle occupation numbers, which implies a radical modification of the standard quasiparticle picture. Consequences of this alteration are surveyed for nuclear, atomic, and solid-state systems.
Keyword(s):
Keyword(s):
2014 ◽
Vol 28
(03)
◽
pp. 1450046
1971 ◽
pp. 500-511
◽
1983 ◽
Vol 9
(8)
◽
pp. L165-L168
◽
Keyword(s):
1997 ◽
Vol 12
(15)
◽
pp. 1095-1099
◽