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Erschienen in:
2012 | OriginalPaper | Buchkapitel
4. Deformation Potential Theory
verfasst von : Zhigang Shuai, Linjun Wang, Chenchen Song
Erschienen in: Theory of Charge Transport in Carbon Electronic Materials
Verlag: Springer Berlin Heidelberg
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Abstract
When the electron–phonon coupling is weak compared with the intermolecular electronic couplings, charge transport can be described by the band mechanism. Namely, the charge moves coherently in a wavelike manner and is scattered by phonon. In this chapter, we introduce the deformation potential theory, which is actually a band model including only the lattice scatterings by the acoustic deformation potential. It is based on the Boltzmann transport equation and sometimes, can be simplified using the effective mass approximation. Contrary to Chap. 3, where only optical phonons are considered, the acoustic phonons are the focus of this chapter. This approach is applied to a typical molecular crystal, naphthalene, and covalently bonded functional materials, graphene and graphdiyne sheets and nanoribbons.