Abstract
We use a recently developed formalism (combining an adiabatic expansion and dynamical mean-field theory) to obtain expressions for isotope effects on electronic properties in correlated systems. As an example we calculate the isotope effect on electron effective mass for the Holstein model as a function of electron-phonon interaction strength and doping. Our systematic expansion generates diagrams which turn out to give the dominant contributions. The isotope effect is small unless the system is near a lattice instability. We compare this to experiment.
- Received 27 November 2001
DOI:https://doi.org/10.1103/PhysRevB.65.224301
©2002 American Physical Society