Optical and Magneto-optical Response of a Doped Mott Insulator

Details Optical and Magneto-optical Response of a Doped Mott Insulator Optical and Magneto-optical Response of a Doped Mott Insulator

1999-07-21

arxiv.org/abs/cond-mat/9907328v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, submitted to PRB

Scientific paper

We study the optical, Raman, and ac Hall response of the doped Mott insulator within the dynamical mean-field theory ($d=\infty$) for strongly correlated electron systems. The occurence of the {\it isosbectic} point in the optical conductivity is shown to be associated with the frequency dependence of the generalized charge susceptibility. We compute the Raman response, which probes the fluctuations of the "stress tensor", and show that the scattering is characterized by appreciable incoherent contributions. The calculated ac Hall constant and Hall angle also exhibit the isosbectic points. These results are also compared with those obtained for a {\it non-FL} metal in $d=\infty$. The role of low-energy coherence (FL) or incoherence (non-FL) in determining the finite frequency response of strongly correlated metals in $d=\infty$ is discussed in detail.

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