Quasiparticle properties of a coupled quantum wire electron-phonon system

Details Quasiparticle properties of a coupled quantum wire electron-phonon system Quasiparticle properties of a coupled quantum wire electron-phonon system

1996-02-27

arxiv.org/abs/cond-mat/9602143v1

Phys. rev. B 54, 4996 (1996)

Physics

Condensed Matter

21 pages, Revtex, 12 figures enclosed

Scientific paper

10.1103/PhysRevB.54.4996

We study leading-order many-body effects of longitudinal optical (LO) phonons on electronic properties of one-dimensional quantum wire systems. We calculate the quasiparticle properties of a weakly polar one dimensional electron gas in the presence of both electron-phonon and electron-electron interactions. The leading-order dynamical screening approximation (GW approximation) is used to obtain the electron self-energy, the quasiparticle spectral function, and the quasiparticle damping rate in our calculation by treating electrons and phonons on an equal footing. Our theory includes effects (within the random phase approximation) of Fermi statistics, Landau damping, plasmon-phonon mode coupling, phonon renormalization, dynamical screening, and impurity scattering. In general, electron-electron and electron-phonon many-body renormalization effects are found to be nonmultiplicative and nonadditive in our theoretical results for quasiparticle properties.

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