Spectral function and kinetic equation for a normal Fermi liquid

Journal Article · Wed Aug 01 00:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.76.054306· OSTI ID:21055103

Arshad, M; Siddique, I ^[1]; Kondratyev, A S ^[1]

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1. School of Mathematical Sciences, GC University, 68-B New Muslim Town, Lahore (Pakistan)

On the basis of the Kadanoff-Baym (KB) version of the time-dependent Green's function method, an Ansatz for the approximation of a spectral function is offered. The Ansatz possesses all the advantages of quasiparticle and extended quasiparticle approximations and satisfies the KB equation for a spectral function in the case of slightly nonequilibrium system when disturbances in space and time are taken into consideration in the gradient approximation. This feature opens opportunities for the microscopic derivation of the Landau kinetic equation for the quasiparticle distribution function of the normal Fermi liquid and provides the widening of these equations' temperature range of validity.

• OSTI ID: 21055103
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 5; Other Information: DOI: 10.1103/PhysRevB.76.054306; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISTRIBUTION FUNCTIONS
FERMI GAS
GREEN FUNCTION
KINETIC EQUATIONS
QUASI PARTICLES
SPECTRAL FUNCTIONS
TEMPERATURE RANGE
TIME DEPENDENCE