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- Title
Ground-state instability in systems of strongly interacting fermions.
- Authors
Artamonov, S. A.; Shaginyan, V. R.; Pogorelov, Yu. G.
- Abstract
The stability of a fermion system is analyzed for a model repulsive pair interaction potential. The possibility of different types of restructuring of the Fermi ground state (at sufficiently great coupling constant) is related to the analyticity properties of such potential. In particular, for the screened Coulomb law it is shown that the restructuring cannot be of the Fermi condensation type, known earlier for some exactly solvable models, but instead belongs to the class of topological transitions. A phase diagram constructed for this model in the variables “screening parameter–coupling constant” displays two kinds of topological transitions: a “5/2” kind, similar to the known Lifshitz transitions in metals, and a “2” kind, characteristic for a uniform strongly interacting system. © 1998 American Institute of Physics.
- Subjects
FERMIONS; STABILITY (Mechanics); NUCLEAR models
- Publication
JETP Letters, 1998, Vol 68, Issue 12, p942
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.567952