Measurement of the optical absorption spectra of epitaxial graphene from terahertz to visible

作者：Dawlaty Jahan M^*; Shivaraman Shriram; Strait Jared; George Paul; Chandrashekhar Mvs; Rana Farhan; Spencer Michael G; Veksler Dmitry; Chen Yunqing

来源：Applied Physics Letters, 2008, 93(13): 131905.

DOI：10.1063/1.2990753

We present experimental results on the optical absorption spectra of epitaxial graphene from the visible to the terahertz frequency range. In the terahertz range, the absorption is dominated by intraband processes with a frequency dependence similar to the Drude model. In the near-IR range, the absorption is due to interband processes and the measured optical conductivity is close to the theoretical value of e(2)/4h. We extract values for the carrier densities, the number of carbon atom layers, and the intraband scattering times from the measurements.

• 出版日期2008-9-29