Journal
REVIEWS OF MODERN PHYSICS
Volume 83, Issue 2, Pages 471-541Publisher
AMER PHYSICAL SOC
DOI: 10.1103/RevModPhys.83.471
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Funding
- Alexander von Humboldt Foundation
- National Science Foundation (NSF)
- Department of Energy (DOE)
- Airforce Office of Scientific Research (AFOSR)
- Office of Naval Research (ONR)
- Electronics and Telecommunications Research Institute (ETRI)
- Deutsche Forschungsgemeinschaft (DFG)
- Swiss National Science Foundation
- National Center of Competence in Research (MaNEP)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0746395, 1005493] Funding Source: National Science Foundation
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Studies of the electromagnetic response of various classes of correlated electron materials including transition-metal oxides, organic and molecular conductors, intermetallic compounds with d and f electrons, as well as magnetic semiconductors are reviewed. Optical inquiry into correlations in all these diverse systems is enabled by experimental access to the fundamental characteristics of an ensemble of electrons including their self-energy and kinetic energy. Steady-state spectroscopy carried out over a broad range of frequencies from microwaves to UV light and fast optics time-resolved techniques provides complimentary prospectives on correlations. Because the theoretical understanding of strong correlations is still evolving, the review is focused on the analysis of the universal trends that are emerging out of a large body of experimental data augmented where possible with insights from numerical studies.
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