Measurement of the Optical Absorption Spectra of Epitaxial Graphene from Terahertz to Visible

Abstract

We present experimental results on the optical absorption spectra of epitaxial graphene from the visible to the terahertz (THz) frequency range. In the THz 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 $e^2/4\hslash$. We extract values for the carrier densities, the number of carbon atom layers, and the intraband scattering times from the measurements.

References in corpus (8)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Detection of Individual Gas Molecules Absorbed on Graphene
• Ultrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics
• Substrate-induced band gap opening in epitaxial graphene
• Magneto-optical conductivity in Graphene
• Few layer graphene on SiC, pyrolitic graphite and graphene: a Raman scattering study

Cited by in corpus (2)

• On the universal AC optical background in graphene
• Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene