title: Disorder-induced magnetoresistance in a two-dimensional electron system.
abstract: We predict and demonstrate that a disorder-induced carrier density inhomogeneity causes magnetoresistance (MR) in a two-dimensional electron system. Our experiments on graphene show a quadratic MR persisting far from the charge neutrality point. Effective medium calculations show that for charged impurity disorder, the low-field MR is a universal function of the ratio of carrier density to fluctuations in carrier density, a power law when this ratio is large, in excellent agreement with experiment. The MR is generic and should occur in other materials with large carrier density inhomogeneity.
authors.affiliation: Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742-4111, USA and School of Physics, Monash University, Victoria 3800, Australia.
authors.forename: Jinglei
authors.initials: J
authors.lastname: Ping
authors.affiliation: Graphene Research Centre and Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore.
authors.forename: Indra
authors.initials: I
authors.lastname: Yudhistira
authors.affiliation: Graphene Research Centre and Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore.
authors.forename: Navneeth
authors.initials: N
authors.lastname: Ramakrishnan
authors.affiliation: Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742-4111, USA.
authors.forename: Sungjae
authors.initials: S
authors.lastname: Cho
authors.affiliation: Graphene Research Centre and Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore and Yale-NUS College, 6 College Avenue East, 138614, Singapore.
authors.forename: Shaffique
authors.initials: S
authors.lastname: Adam
authors.affiliation: Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742-4111, USA and School of Physics, Monash University, Victoria 3800, Australia.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Fuhrer