Raman Scattering studies of Topological Insulators Bi$_2$Te$_3$, Bi$_2$Se$_3$, and Sb$_2$Te$_3$*

Raman scattering spectroscopy has been used to probe the bismuth and antimony chalcogenides Bi$_2$Se$_3$, Bi$_2$Te$_3$, and Sb$_2$Te$_3$. Room temperature spectra of these topological insulators reveal new phonon modes in spectral regions not previously investigated. Polarization studies have been done to characterize these modes. New results on the temperature dependence of the Raman active phonon modes in these materials will also be presented.