Ripples of AA and AB stacking bilayer graphenes
National Laboratory of Solid State Microstructures and Department of
Physics, Nanjing University, Nanjing, 210093, P.R. China
Corresponding author: a email@example.com
Revised: 28 September 2010
Published online: 28 October 2010
Using the classical molecular dynamics simulations, we have investigated the thermally-excited ripples of the AA- and AB-stacking bilayer graphenes (BLGs) at different temperatures, and compared them with those of the single layer graphene (SLG). It is found that: (1) the ripples in both AA- and AB-stacking BLGs are intrinsic with a characteristic size of about 100 Å at room temperature, increasing with increase of temperature. (2) The ripple's intralayer height-height correlation functions for the two types of BLGs follow a power-law behavior, Gh(q) ~ q-α, with the same scaling exponent at the same temperature, which decreases as temperature increases. (3) The ripple's height of the AB-stacking BLG is larger than that of the AA-stacking one at the lower temperatures. (4) Finally, the ripple's height in the two types of BLGs is greatly smaller than that in the SLG, which is consistent with the experimental results.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010