title: Nonlinear dc transport in graphene.
abstract: Considering electron-impurity, electron-acoustic-phonon and electron-optical-phonon scatterings, the nonlinear steady-state transport properties of graphene are studied theoretically by means of the balance equation approach. We find that the conductivity as a function of electric field strength, E, exhibits strongly nonlinear behavior for E larger than a critical value, E(c)≈0.1 kV cm(-1). With the increase of E from zero, the conductivity first decreases slowly and then it falls rapidly when E>E(c). The dependence of electron temperature on E is also demonstrated.
authors.affiliation: Department of Physics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China.
authors.forename: W S
authors.initials: WS
authors.lastname: Bao
authors.forename: S Y
authors.initials: SY
authors.lastname: Liu
authors.forename: X L
authors.initials: XL
authors.lastname: Lei
authors.forename: C M
authors.initials: CM
authors.lastname: Wang