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

95 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

General Physics and Astronomy

Access to Document

10.1103/PhysRevLett.99.206803

Cite this

@article{436f134c2571401caeb7f6cd757a0dc5,

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.",

author = "Giesbers, {A. J.M.} and U. Zeitler and Katsnelson, {M. I.} and Ponomarenko, {L. A.} and Mohiuddin, {T. M.} and Maan, {J. C.}",

year = "2007",

month = nov,

day = "14",

doi = "10.1103/PhysRevLett.99.206803",

language = "English",

volume = "99",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "20",

}

TY - JOUR

T1 - Quantum-hall activation gaps in graphene

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.

UR - http://www.scopus.com/inward/record.url?scp=36148964062&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36148964062&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.99.206803

DO - 10.1103/PhysRevLett.99.206803

M3 - Article

C2 - 18233175

AN - SCOPUS:36148964062

SN - 0031-9007

VL - 99

JO - Physical Review Letters

JF - Physical Review Letters

IS - 20

M1 - 206803

ER -

Quantum-hall activation gaps in graphene

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this