Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-11-26
Phys. Rev. B 65, 224301 (2002)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures; added discussion of isotope effect away from half filling
Scientific paper
10.1103/PhysRevB.65.224301
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 neglected in previous studies, 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.
Deppeler A.
Millis Andrew. J.
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