Optical Conductivity in Mott-Hubbard Systems

Details Optical Conductivity in Mott-Hubbard Systems Optical Conductivity in Mott-Hubbard Systems

1995-07-03

arxiv.org/abs/cond-mat/9507002v1

Physics

Condensed Matter

12 pages and 4 figures, to appear in Phys. Rev. Lett., v 75, p 105 (1995)

Scientific paper

10.1103/PhysRevLett.75.105

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 $V_2O_3$. 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.

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