Numerical analysis on vibrational properties of vacancy-type disordered graphane

We theoretically explore the vacancy induced vibrational properties of graphane using the forced vibrational method. We find strong changes in the phonon density of states for vacancy-type disordered graphane, revealing the significant impacts on the electron transport properties. The phonon eigenvectors estimated for the K point in-plane transverse optical mode for the defective graphane show the strongly localized vibrations. The localization effects manifest themselves in the projected temperature behavior of the constant-volume specific heat capacity of pristine and disordered graphane samples.