title: AC conductivity parameters of graphene derived from THz etalon transmittance.
abstract: THz frequency-domain transmittance measurements were carried out on chemical-vapor-deposited (CVD) graphene films transferred to high-resistivity silicon substrates, and packaged as back-gated graphene field effect transistors (G-FETs). The graphene AC conductivity σ(ω), both real and imaginary parts, is determined between 0.2 and 1.2 THz from the transmittance using the transmission matrix method and curve-fitting techniques. Critical parameters such as the charge-impurity scattering width and chemical potential are calculated. It is found that not only the sheet charge density but also the scattering parameter can be modified by the back-gate voltage.
authors.affiliation: Terahertz Sensors Laboratory, Departments of Physics and Electrical Engineering, Wright State University, Dayton, OH 45435, USA. weidong.zhang@wright.edu.
authors.forename: Weidong
authors.initials: W
authors.lastname: Zhang
authors.forename: Phi H Q
authors.initials: PH
authors.lastname: Pham
authors.forename: Elliott R
authors.initials: ER
authors.lastname: Brown
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Burke