Abstract
We study the transfer of spectral weight in the optical spectra of a strongly correlated electron system as a function of temperature and interaction strength. Within a dynamical mean field theory of the Hubbard model that becomes exact in the limit of large lattice coordination, we predict an anomalous enhancement of spectral weight as a function of temperature in the correlated metallic state and report on experimental measurements which agree with this prediction in . We argue that the optical conductivity anomalies in the metal are connected to the proximity to a crossover region in the phase diagram of the model.
- Received 13 March 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.105
©1995 American Physical Society