Abstract:
We show that the optical response of metals with strong electron-electron correlation consists of two excitations, a renormalized Drude response at zero energy and a mid-infrared peak occurring at frequencies around 2000 cm-1. The latter originates from a dynamical, correlation-induced gap, as evinced from a many body theoretical approach based on the periodic Anderson model. At very low temperatures, it can be viewed as optical gap between two renormalized quasi-particle bands. The gap size is proportional to the geometric mean of the characteristic lattice Kondo temperature of the material and its bandwidth.
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Received 28 August 2000 and Received in final form 31 October 2000
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Degiorgi, L., Anders, F. & Grüner, G. Charge excitations in heavy electron metals. Eur. Phys. J. B 19, 167–170 (2001). https://doi.org/10.1007/s100510170324
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DOI: https://doi.org/10.1007/s100510170324