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• W2156861112 abstract "We show that second-harmonic generation (SHG) and sum-frequency generation (SFG) are selective tools for probing excitons. In SHG and SFG measurements performed on ${mathrm{C}}_{60}$ and CuCl films we observe Frenkel and Wannier excitons, respectively. On the other hand, no second-harmonic (sum-frequency) intensity enhancement was observed at energies above the conductivity gap. This is in strong contrast to, for instance, one-photon and two-photon absorption experiments. The selectivity of SHG and SFG for excitons compared to interband transitions can be explained in terms of coherence of the respective excitation processes." @default.
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• W2156861112 date "2001-02-06" @default.
• W2156861112 modified "2023-10-16" @default.
• W2156861112 title "Second-harmonic generation spectroscopy: A technique for selectively probing excitons" @default.
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• W2156861112 doi "https://doi.org/10.1103/physrevb.63.085111" @default.
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