Abstract
The photon–phonon coupling at C(001)-(2 × 1) surfaces and its manifestation in far-infrared reflectance anisotropy spectra(FIR-RAS) are theoretically investigated. We solve the coupled system ofequations for the electromagnetic field and lattice vibrations, described withinthe adiabatic bond charge model (ABCM), with the method of expansion intobulk phonon and photon modes. The calculated FIR-RAS exhibit resonancesassociated with zone-center surface phonons in good agreement with availableHREELS experiments and predictions of vibrational modes for diamond (001)-(2 × 1)surfaces from ABCM and ab initio calculations. Interestingly, the reflectance anisotropy spectra for aC(001)-(2 × 1) surface turn out to be qualitatively different from the spectra for a Si(001)-(2 × 1) surface, reported previously.
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