Spectral Properties of the Su-Schrieffer-Heeger Model

Details Spectral Properties of the Su-Schrieffer-Heeger Model Spectral Properties of the Su-Schrieffer-Heeger Model

2002-06-07

arxiv.org/abs/cond-mat/0206116v1

Solid State Communications Vol. 122, 531 (2002)

Physics

Condensed Matter

Materials Science

To appear in Solid State Communications - 5 figures

Scientific paper

10.1016/S0038-1098(02)00183-7

We present a study of the one dimensional Su-Schrieffer-Heeger model Hamiltonian by a diagrammatic perturbative method in the weak electron-phonon coupling regime. Exact computation of both the charge carrier effective mass and the electron spectral function shows that electrons are good quasiparticles in the adiabatic and antiadiabatic limits but novel features emerge in the intermediate regime, where the phonons and the electrons compare on the energy scale. Together with a sizeable mass enhancement we observe, in the latter regime, a spread of the spectral weight (among several transition peaks) associated with an increased relevance of multiphonons contributions at larger {\it e-ph} couplings. Accordingly electrons cease to be the good quasiparticles and an onset of polaron formation is favoured.

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