Studies of the electromagnetic response of various classes of correlated electron materials
including transition-metal oxides, organic and molecular conductors, intermetallic …

Abstract The Falicov-Kimball model was introduced in 1969 as a statistical model for metal-
insulator transitions; it includes itinerant and localized electrons that mutually interact with a …

The optical conductivity [σ (ω)] of the Kondo semiconductor YbB 12 has been measured over
wide ranges of temperature (T= 8–690 K) and photon energy (meV). The σ (ω) data reveal …

Dynamical conductivity spectra [σ (ω)] have been measured for many heavy-fermion (HF) Ce
and Yb compounds. A characteristic excitation peak has been observed in the infrared …

In this article, we review the charge excitations of heavy fermion compounds probed by
infrared spectroscopy. The article is not meant to be a comprehensive survey of …

Owing to its high brilliance, infrared and terahertz synchrotron radiation (IR/THz-SR) has
emerged as a powerful tool for spectroscopy under extreme (ie, technically more difficult) …

The exact solution for the thermodynamic and dynamie properties of the infinite-dimensional
multicomponent Falicov-Kimball model for arbitrary concentrations of d and f electrons is …

Theoretical work on Kondo systems predicts universality in the scaling of observable
quantities with the Kondo temperature, TK. Here we report infrared-frequency optical …

We have investigated the optical conductivity of the prominent valence-fluctuating
compounds EuIr 2 Si 2 and EuNi 2 P 2 in the infrared energy range to get new insights into …

Optical conductivity [σ (ω)] of YbS has been measured under pressure up to 20 GPa. Below
8 GPa, σ (ω) is low since YbS is an insulator with an energy gap between a fully occupied 4 f …