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Updated: May 23, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
Magnetoresistance measurements of graphene at the charge neutrality point
Yue Zhao1, Paul Cadden-Zimansky, Fereshte Ghahari
1Department of Physics, Columbia University, New York, New York 10027, USA.
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.
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