J. Devreese

Research outputpeer-review


The theory of the behaviour of slow electrons in a polar crystal is reviewed. First the adiabatic approximation is treted on classical and also on quantum-mechanical grounds. The field theoretical treatment is given here with the aid of the Tomonaga approximation. The results of the investigation of this problem with the aid of the "path-integral" formalism are mentioned. The applicability of the various approaches is discussed for different values of the coupling constant. A comparison is made between the different theories.
This article was originally presented as a series of lectures given at the Solid State Physics department of the S.C.K., Mol (Belgium).
Original languageEnglish
PublisherSCK CEN
Number of pages23
StatePublished - Sep 1962
Externally publishedYes

Publication series

NameSCK CEN Reports
PublisherSCK CEN

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