Electron Mass Enhancement due to Anharmonic Local Phonons
Strongly Correlated Electrons
2015-05-27 v2 Materials Science
Abstract
In order to understand how electron effective mass is enhanced by anharmonic local oscillation of an atom in a cage composed of other atoms, i.e., {\it rattling}, we analyze anharmonic Holstein model by using a Green's function method. Due to the evaluation of an electron mass enhancement factor , we find that becomes maximum when zero-point energy is comparable with potential height at which the amplitude of oscillation is rapidly enlarged. Cooperation of such quantum and rattling effects is considered to be a key issue to explain the electron mass enhancement in electron-rattling systems.
Cite
@article{arxiv.1102.3275,
title = {Electron Mass Enhancement due to Anharmonic Local Phonons},
author = {Kunihiro Oshiba and Takashi Hotta},
journal= {arXiv preprint arXiv:1102.3275},
year = {2015}
}
Comments
3 pages, 3 figures, to appear in J. Phys. Soc. Jpn. Suppl. (Proceedings for International Conference on Heavy Electrons)