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

Escoffier, W.; Poumirol, J. M.; Amado, M.; Rossella, Francesco; Kumar, A.; Diez, E.; Goiran, M.; Bellani, Vittorio; Raquet, B.

doi:10.1007/978-3-642-20644-3

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.

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Titolo:	High field quantum Hall effect in disordered graphene dear the Dirac point
Autori:	W. Escoffier J. M. Poumirol M. Amado ROSSELLA, FRANCESCO A. Kumar E. Diez M. Goiran BELLANI, VITTORIO B. Raquet mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	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.
Handle:	http://hdl.handle.net/11571/433231
ISBN:	9783642206436
Appare nelle tipologie:	4.1 Contributo in Atti di convegno

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