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- W2000759634 abstract "Most alkali halides crystallize in the fcc sodium chloride structure. In contrast, with the exception of CsF, the Cs-halides form the simple cubic cesium chloride (CsCl) structure at ambient conditions and they have a substantially different electronic structure than other alkali halides; in particular, they have several nearly degenerate electronic levels near the Brillouin zone center. Highly resolved three-photon spectroscopy (TPS) measurements allow direct observation of the near band edge structure and, in the case of CsI, probe more states than one-photon techniques. A number of interesting phenomena, among them level repulsion (Fermi resonance), occur as these levels are tuned through one another by application of hydrostatic pressure. Doubling the photon energy range compared to a previous publication [see Yoo et al., Phys. Rev. Lett 84, 3875 (2000)] allows direct observation of the $n=1$, 2, and 3 exciton-polariton members of the ${ensuremath{Gamma}}_{8}^{ensuremath{-}}text{ensuremath{-}}{ensuremath{Gamma}}_{6}^{+}$ transition in CsI and lets us establish unambiguous values for the band gap $(6.135phantom{rule{0.3em}{0ex}}mathrm{eV})$, binding energy $(0.263phantom{rule{0.3em}{0ex}}mathrm{eV})$, and their pressure dependence up to $7phantom{rule{0.3em}{0ex}}mathrm{kbar}$. Similarly to CsI, the CsBr linewidth of the lowest ${ensuremath{Gamma}}_{4}^{ensuremath{-}}$ polariton $(A)$ decreases upon compression and its bandgap must be higher than $7.20phantom{rule{0.3em}{0ex}}mathrm{eV}$." @default.
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- W2000759634 date "2006-02-28" @default.
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- W2000759634 title "Band-structure parameters and Fermi resonances of exciton-polaritons in CsI and CsBr under hydrostatic pressure" @default.
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- W2000759634 doi "https://doi.org/10.1103/physrevb.73.085121" @default.
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