Quasi-particle interaction and anomalies in the excitation spectra of metals

  • H. Eschrig
  • M. I. Kaganov
Invited Talks III. Electron-Phonon Interaction
Part of the Lecture Notes in Physics book series (LNP, volume 285)


The low-energy excitation spectrum of a paramagnetic metal in the absence of an external magnetic field consists of phonons filling the whole quasi-momentum space and of electrons in a thin layer around the Fermi surface. The interaction of these quasi-particles results in a renormazization of the energies and in a finite life-time. The renormazization contains a variety of anomalies - divergenecies of the spectra or its derivatives, the group velocities - in which the local geometry of the Fermi surface manifests. The divergencies are cut off due to various damping processes, it is however to be expected that peaks remain some of which being experimentally detected. The phenomena discussed are general, i.e. to be expected present in any metal. The given treatment continues the semi-phenomenological theory of metals developed by 1. M. Lifshits and his school.


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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • H. Eschrig
    • 1
  • M. I. Kaganov
    • 2
  1. 1.Zentralinstitut fuer Festkoerperphysik und Werkstofforschung der AdW der DDRDresdenGDR
  2. 2.Institute of Physical ProblemsAcademy of sciences of USSRMoscow

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