We investigate on the conductance properties of low mobility graphene in the quantum Hall regime at filling factor less than v=2 For this purpose, we compare the high-field longitudinal and Hall resistances of two graphene samples with different mobility. We show that the presence of “charge density puddles”, most probably due to charged impurities, particularly affect the fundamental high field electronic properties of graphene. In particular, the Hall resistance plateau at RXY=h2e2 is unstable and shows a non-monotonic behaviour when the system is driven close to the Dirac point. This phenomenon is ascribed to as Fermi level pinning in the Landau Level sub-bands of graphene, in the presence of disorder.

High field quantum Hall effect in disordered graphene dear the Dirac point

ROSSELLA, FRANCESCO;
2012

Abstract

We investigate on the conductance properties of low mobility graphene in the quantum Hall regime at filling factor less than v=2 For this purpose, we compare the high-field longitudinal and Hall resistances of two graphene samples with different mobility. We show that the presence of “charge density puddles”, most probably due to charged impurities, particularly affect the fundamental high field electronic properties of graphene. In particular, the Hall resistance plateau at RXY=h2e2 is unstable and shows a non-monotonic behaviour when the system is driven close to the Dirac point. This phenomenon is ascribed to as Fermi level pinning in the Landau Level sub-bands of graphene, in the presence of disorder.
2012
Workshop on Fundamentals and Applications of Graphene
Assergy, Italy
15-18 May 2011
GraphITA 2011, Selected papers from the Workshop on Fundamentals and Applications of Graphene
SPRINGER
9783642206436
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/13395
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