2:30 PM - 2:45 PM
[25p-E102-5] Theoretical Calculation of Far-infrared and tera-Hz Absorbance of Graphene at 300K
Keywords:Graphene, Graphite, Absorbance
The far-infrared (FIR) and tera-Hz (THz) absorbance of graphene at 300K was theoretically calculated by considering the thermal excitation of its Dirac cones and the Drude term due to thermally excited electrons and holes of the Dirac cones. The thermal excitation of the Dirac cones was calculated from first principles by using the density functional pseudopotential method., and the Drude term was calculated with the Drude model for Dirac cones. Experimental Drude parameters were used for the calculation. The Calculation clarified that although the absorbance of graphene at 300K is smaller than the value at 0K (c.a. 0.023), it is larger than the absorbance of graphite at 300K, calculated for comparison. The result demonstrates that graphene is a FIR and THz light absorber superior to graphite even at room temperature.