9:00 AM - 9:15 AM
[16a-Z31-1] First principles study of absorbance of double layer graphene in a far-infrared and tera-Hz frequency region
Keywords:graphene, absorbance, first principles calculation
Absorbance of double layer graphene (DLG) in a far-infrared and tera-Hz frequency region was calculated from first principles by using the density functional pseudopotential method in the generalized gradient approximation. We found that the absorbance of DLG drastically changes, depending on its layer structure; i. e., the absorbance of AA stacking DLG was zero, that of AB stacking DLG was lower than two times that of mono layer graphene (MLG), while that of random stacking DLG was almost equal to two times that of MLG. The difference in absorbance is due to that the Dirac cone is destroyed or preserved in DLG. The random stacking DLG was found to be a good absorber of far-infrared and tera-Hz lights. In this talk, we will present the results of the calculations as well as those of analyses on the relation between the absorbance and electronic strutcure of DLG.