Excitons in Cu2O : From quantum dots to bulk crystals and additional boundary conditions for Rydberg exciton-polaritons

@article{Ziemkiewicz2020ExcitonsI,
  title={Excitons in 
Cu2O
: From quantum dots to bulk crystals and additional boundary conditions for Rydberg exciton-polaritons},
  author={David Ziemkiewicz and Karol Karpi'nski and Gerard Czajkowski and Sylwia Zieli'nska-Raczy'nska},
  journal={Physical Review B},
  year={2020}
}
We propose a scheme for calculation of optical functions of a semiconductor with Rydberg excitons, for a wide interval of dimensions. We start with 2-dimensional structure, then going to thin films and ending on 3-dimensional bulk crystals. The calculations including the polaritons are performed, the case of large number of polariton branches is discussed and obtained theoretical absorption spectra show good agreement with experimental data. 
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From detailed comparison of experiment and theory, the cubic anisotropy parameter of the Cu(2)O valence band is determined, which shows a threefold splitting that depends systematically on n, in agreement with theoretical considerations.
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We show how to compute the magnetooptical functions (absorption, reflection, and transmission) when Rydberg Exciton-Polaritons appear, including the effect of the coherence between the electron-hole…
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