Electron Mass Enhancement due to Anharmonic Local Phonons

Details Electron Mass Enhancement due to Anharmonic Local Phonons Electron Mass Enhancement due to Anharmonic Local Phonons

2011-02-16

arxiv.org/abs/1102.3275v2

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 3 figures, to appear in J. Phys. Soc. Jpn. Suppl. (Proceedings for International Conference on Heavy Electrons)

Scientific paper

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 $Z$, we find that $Z$ 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.

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