Temperature dependence of the optical spectral weight in the cuprates: Role of electron correlations

Abstract

We compare calculations based on the Dynamical Mean-Field Theory of the Hubbard model with the infrared spectral weight $W(\Omega ,T)$ of La${}_{2-x}$Sr${}_x$CuO${}_4$ and other cuprates. Without using fitting parameters we show that most of the anomalies found in $W(\Omega ,T)$ with respect to normal metals, including the existence of two different energy scales for the doping- and the $T$-dependence of $W(\Omega ,T)$, can be ascribed to strong correlation effects.

arXiv comment4 pages, 3 figures. Minor corrections, corrected some typos and added references

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