title: Giant magnetodrag in graphene at charge neutrality.
abstract: We report experimental data and theoretical analysis of Coulomb drag between two closely positioned graphene monolayers in a weak magnetic field. Close enough to the neutrality point, the coexistence of electrons and holes in each layer leads to a dramatic increase of the drag resistivity. Away from charge neutrality, we observe nonzero Hall drag. The observed phenomena are explained by decoupling of electric and quasiparticle currents which are orthogonal at charge neutrality. The sign of magnetodrag depends on the energy relaxation rate and geometry of the sample.
authors.affiliation: Radboud University Nijmegen, Institute for Molecules and Materials, NL-6525 AJ Nijmegen, Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Titov
authors.forename: R V
authors.initials: RV
authors.lastname: Gorbachev
authors.forename: B N
authors.initials: BN
authors.lastname: Narozhny
authors.forename: T
authors.initials: T
authors.lastname: Tudorovskiy
authors.forename: M
authors.initials: M
authors.lastname: Schütt
authors.forename: P M
authors.initials: PM
authors.lastname: Ostrovsky
authors.forename: I V
authors.initials: IV
authors.lastname: Gornyi
authors.forename: A D
authors.initials: AD
authors.lastname: Mirlin
authors.forename: M I
authors.initials: MI
authors.lastname: Katsnelson
authors.forename: K S
authors.initials: KS
authors.lastname: Novoselov
authors.forename: A K
authors.initials: AK
authors.lastname: Geim
authors.forename: L A
authors.initials: LA
authors.lastname: Ponomarenko