Quantum-hall activation gaps in graphene

A. J.M. Giesbers; U. Zeitler; M. I. Katsnelson; L. A. Ponomarenko; T. M. Mohiuddin; J. C. Maan

doi:10.1103/PhysRevLett.99.206803

Quantum-hall activation gaps in graphene

A. J.M. Giesbers^*, U. Zeitler, M. I. Katsnelson, L. A. Ponomarenko, T. M. Mohiuddin, J. C. Maan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

91 Citations (Scopus)

Abstract

We have measured the quantum-Hall activation gaps in graphene at filling factors ν=2 and ν=6 for magnetic fields up to 32 T and temperatures from 4 to 300 K. The ν=6 gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at ν=2 is strongly temperature and field dependent and approaches the expected value for sharp Landau levels for fields B>20T and temperatures T>100K. We explain this surprising behavior by a narrowing of the lowest Landau level.

Original language	English
Article number	206803
Journal	Physical Review Letters
Volume	99
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.99.206803
Publication status	Published - Nov 14 2007
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.99.206803

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title = "Quantum-hall activation gaps in graphene",

abstract = "We have measured the quantum-Hall activation gaps in graphene at filling factors ν=2 and ν=6 for magnetic fields up to 32 T and temperatures from 4 to 300 K. The ν=6 gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at ν=2 is strongly temperature and field dependent and approaches the expected value for sharp Landau levels for fields B>20T and temperatures T>100K. We explain this surprising behavior by a narrowing of the lowest Landau level.",

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AU - Giesbers, A. J.M.

AU - Zeitler, U.

AU - Katsnelson, M. I.

AU - Ponomarenko, L. A.

AU - Mohiuddin, T. M.

AU - Maan, J. C.

PY - 2007/11/14

Y1 - 2007/11/14

N2 - We have measured the quantum-Hall activation gaps in graphene at filling factors ν=2 and ν=6 for magnetic fields up to 32 T and temperatures from 4 to 300 K. The ν=6 gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at ν=2 is strongly temperature and field dependent and approaches the expected value for sharp Landau levels for fields B>20T and temperatures T>100K. We explain this surprising behavior by a narrowing of the lowest Landau level.

AB - We have measured the quantum-Hall activation gaps in graphene at filling factors ν=2 and ν=6 for magnetic fields up to 32 T and temperatures from 4 to 300 K. The ν=6 gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at ν=2 is strongly temperature and field dependent and approaches the expected value for sharp Landau levels for fields B>20T and temperatures T>100K. We explain this surprising behavior by a narrowing of the lowest Landau level.

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Quantum-hall activation gaps in graphene

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