Mass Renormalization in the Su-Schrieffer-Heeger Model

Details Mass Renormalization in the Su-Schrieffer-Heeger Model Mass Renormalization in the Su-Schrieffer-Heeger Model

2002-06-07

arxiv.org/abs/cond-mat/0206114v1

Phys.Rev.B, Vol. 66, 012303 (2002)

Physics

Condensed Matter

Superconductivity

To be published in Phys.Rev.B - 3 figures

Scientific paper

10.1103/PhysRevB.66.012303

This study of the one dimensional Su-Schrieffer-Heeger model in a weak coupling perturbative regime points out the effective mass behavior as a function of the adiabatic parameter $\omega_{\pi}/J$, $\omega_{\pi}$ is the zone boundary phonon energy and $J$ is the electron band hopping integral. Computation of low order diagrams shows that two phonons scattering processes become appreciable in the intermediate regime in which zone boundary phonons energetically compete with band electrons. Consistently, in the intermediate (and also moderately antiadiabatic) range the relevant mass renormalization signals the onset of a polaronic crossover whereas the electrons are essentially undressed in the fully adiabatic and antiadiabatic systems. The effective mass is roughly twice as much the bare band value in the intermediate regime while an abrupt increase (mainly related to the peculiar 1D dispersion relations) is obtained at $\omega_{\pi}\sim \sqrt{2}J$.

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