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Optical Properties of Correlated Electrons

Chapter
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 180)

Abstract

Optical spectra provide a versatile tool for studying the electronic properties of matter. In addition, the absolute spectral weight of an optical spectrum reveals optical sum-rules, which are one of the most powerful tools of experimental and theoretical physics providing access to deeply rooted quantities such as the effective mass of the charge carriers and their kinetic energy. The formalism for the optical conductivity of correlated electrons is presented in this chapter for general values of the inverse wavelength \(q\) and general band dispersion \(\epsilon _k\) of the electrons. The corresponding sumrule is found to have a characteristic \(q\)-dependence for the nearest-neighbour tight binding model, causing in this case a vanishing of spectral weight for \(q\) at the Brillouin-zone boundary, i.e. for \(qa=\pi \). These findings are of possible importance for \(k\)-resolved infrared spectroscopy, a technique which is in full development at the moment.

Keywords

Vector Potential Current Operator Optical Conductivity Electron Energy Loss Spectroscopy Regular Part 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

It is a pleasure to thank Adrian Kantian, Christophe Berthod, Alexey Kuzmenko and Gianni Blatter for their comments. This work was supported by the SNSF through Grants No. 200020-140761 and 200020-135085, and the National Center of Competence in Research (NCCR) Materials with Novel Electronic PropertiesMaNEP.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Département de Physique de la Matière CondenséeUniversité de GenèveGenève 4Switzerland

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