title: Magnetoresistance measurements of graphene at the charge neutrality point.
abstract: We report on transport measurements of the insulating state that forms at the charge neutrality point of graphene in a magnetic field. Using both conventional two-terminal measurements, sensitive to bulk and edge conductance, and Corbino measurements, sensitive only to the bulk conductance, we observed a vanishing conductance with increasing magnetic fields. By examining the resistance changes of this insulating state with varying perpendicular and in-plane fields, we probe the spin-active components of the excitations in total fields of up to 45 T. Our results indicate that the ν=0 quantum Hall state in single layer graphene is not spin-polarized.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhao
authors.forename: Paul
authors.initials: P
authors.lastname: Cadden-Zimansky
authors.forename: Fereshte
authors.initials: F
authors.lastname: Ghahari
authors.forename: Philip
authors.initials: P
authors.lastname: Kim