Local vibrational modes of carbon in GaSb and GaAsSb

Chen, X. K.; Wiersma, R.; Wang, C. X.; Pitts, O. J.; Dale, C.; Bolognesi, C. R.; Watkins, S. P.
March 2002
Applied Physics Letters;3/18/2002, Vol. 80 Issue 11, p1942
Academic Journal
We have measured the Raman spectra of heavily carbon doped (p > 10[sup 19] cm[sup -3]) GaSb and GaAsSb. A local vibrational mode (LVM) due to carbon residing on group-V lattice sites was observed at 540 cm[sup -1] for GaSb and 568 cm[sup -1] for GaAs[sub 0.44]Sb[sub 0.56]. A gap mode at 164 cm[sup -1] was observed for GaSb. The frequency of the LVM as well as the gap mode is in quantitative agreement with recent theoretical predictions.


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