title: Infrared conductivity and carrier mobility of large scale graphene on various substrates.
abstract: It is known that low-field mobility of graphene depends largely on the substrate material on which it is transferred. We measured Drude optical conductivity of graphene on various substrates and determined the carrier density and carrier scattering rate. The carrier density varies widely depending on the substrate material. However the scattering rate is almost constant, approximately 100 cm(-1), for 5 different substrates. We calculate carrier mobility of graphene using the two quantities, i.e., carrier density and scattering rate, to find that it agrees with the mobility measured from dc transport experiment. We conclude that substrate-depent mobility of graphene originates from different carrier density but not from the scattering rate.
authors.affiliation: Department of Physics, University of Seoul, Seoul 130-743, Republic of Korea.
authors.forename: Joo Youn
authors.initials: JY
authors.lastname: Kim
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Rho
authors.forename: Chul
authors.initials: C
authors.lastname: Lee
authors.forename: Sukang
authors.initials: S
authors.lastname: Bae
authors.forename: Sang Jin
authors.initials: SJ
authors.lastname: Kim
authors.forename: Keun Soo
authors.initials: KS
authors.lastname: Kim
authors.forename: Byung Hee
authors.initials: BH
authors.lastname: Hong
authors.forename: E J
authors.initials: EJ
authors.lastname: Choi