Electron Mass Enhancement due to Anharmonic Local Phonons

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 $Z$, 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.

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

Cited by in corpus (4)

• Strong-Coupling Theory of Rattling-Induced Superconductivity
• Attractive Su-Schrieffer-Heeger-Hubbard Model on a Square Lattice Away from Half-Filling
• Heavy-Electron Formation and Bipolaronic Transition in the Anharmonic Holstein Model
• Anomalous Isotope Effect in Rattling-Induced Superconductor