Polarized Raman scattering of impurity modes in beryllium-doped cubic boron nitride single crystals

Watanabe, Kenji; Taniguchi, Takashi; Kanda, Hisao; Shishonok, Elena M.
May 2003
Applied Physics Letters;5/5/2003, Vol. 82 Issue 18, p2972
Academic Journal
Impurity-induced modes at 212 and 535 cm[sup -1] have been studied by using Raman scattering spectroscopy in Be-doped cubic boron nitride single crystals, which have been grown by the temperature-gradient method under high pressure. Those bands show prominent polarization properties of T[sub 2] and A[sub 1] modes for the 212 and 535 cm[sup -1] bands, respectively. Based on the polarization properties and a simple calculation of a molecular model, the origin of the bands is explained by postulating resonance modes of substitutional Be with a weak force constant between the host atoms and the Be. Anomalies of a forbidden transverse optical mode and the T[sub 2] mode due to phonon-plasma coupling caused by photoexcited free carriers have been also observed in high excitation density.


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