Absorption-edge singularities for a nonequilibrium Fermi sea. III. Determinantal nonperturbative theory

Journal Article · Sun Oct 15 00:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.11698· OSTI ID:122348

Tanguy, C ^[1]; Combescot, M ^[2]

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1. France Telecom, Centre National d`Etudes des Telecommunications, Paris B, Laboratoire de Bagneux, Boite Postale 107, 92225 Bagneux Cedex (France)
2. Groupe de Physique des Solides, Universite Pierre et Marie Curie, CNRS, Tour 23, 2 place Jussieu, 75005 Paris (France)

The nonperturbative solution to the problem of threshold singularities for a ({mu}{sub 1},{mu}{sub 2}) nonequilibrium Fermi sea is obtained using the determinantal method of Ohtaka and Tanabe. The critical exponents of the absorption power-law behavior we find agree with those estimated from the perturbative treatment of the problem given in papers I and II. A family of possibly diverging singularities is found at energies {mu}{sub 2}+{ital n}({mu}{sub 1}{minus}{mu}{sub 2}), for {ital n}{ge}1.

• OSTI ID: 122348
• Journal Information: Physical Review, B: Condensed Matter, Vol. 52, Issue 16; Other Information: PBD: 15 Oct 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
FERMI GAS
ABSORPTION SPECTRA
SINGULARITY
PERTURBATION THEORY
PROPAGATOR
ELECTRON-HOLE COUPLING