Abstract
Optical spectroscopy is one of the oldest techniques in condensed-matter research, starting from the earliest observations of interference fringes in the intensity of light scattered from thin films, dating back to Newton, to taking into account the relative phases of two independent polarizations of light, carried out in the work of Drude.
Keywords
- Dielectric Function
- Superconducting State
- Optical Conductivity
- Spectral Weight
- Spectroscopic Ellipsometry
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In theory, there is no difference between theory and practice. In practice, there is.
—Jan L. A. van de Snepscheut
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Notes
- 1.
A small contamination from the \(z\) component of the dielectric tensor is always present due to an inevitable deviation of the angle of incidence from the normal to the sample surface arising from the simple practical limitation that the incident and reflected light must be spatially separated to enable the analysis of the latter.
- 2.
This is, strictly speaking, only true when the unity contribution to the real part of the dielectric function has been subtracted, that is \(\varepsilon (\omega )-1\) is a response function. See below for the definition of the dielectric function in terms of the charge susceptibility, which is a true response function.
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Charnukha, A. (2014). Experimental and Theoretical Methods. In: Charge Dynamics in 122 Iron-Based Superconductors. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-01192-9_3
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