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Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene.

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Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene. / Novoselov, K. S.; McCann, Edward; Morozov, S. V. et al.
In: Nature Physics, Vol. 2, No. 3, 03.2006, p. 177-180.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Novoselov, KS, McCann, E, Morozov, SV, Fal’ko, VI, Katsnelson, MI, Zeitler, U, Jiang, D, Schedin, F & Geim, AK 2006, 'Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene.', Nature Physics, vol. 2, no. 3, pp. 177-180. https://doi.org/10.1038/nphys245

APA

Novoselov, K. S., McCann, E., Morozov, S. V., Fal’ko, V. I., Katsnelson, M. I., Zeitler, U., Jiang, D., Schedin, F., & Geim, A. K. (2006). Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene. Nature Physics, 2(3), 177-180. https://doi.org/10.1038/nphys245

Vancouver

Novoselov KS, McCann E, Morozov SV, Fal’ko VI, Katsnelson MI, Zeitler U et al. Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene. Nature Physics. 2006 Mar;2(3):177-180. doi: 10.1038/nphys245

Author

Novoselov, K. S. ; McCann, Edward ; Morozov, S. V. et al. / Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene. In: Nature Physics. 2006 ; Vol. 2, No. 3. pp. 177-180.

Bibtex

@article{6d75062d32a24c48a1f37db324d03668,
title = "Unconventional quantum Hall effect and Berry{\textquoteright}s phase 2pi in bilayer graphene.",
abstract = "There are known two distinct types of the integer quantum Hall effect. One is the conventional quantum Hall effect, characteristic of two-dimensional semiconductor systems, and the other is its relativistic counterpart recently observed in graphene, where charge carriers mimic Dirac fermions characterized by Berry{\textquoteright}s phase pi, which results in a shifted positions of Hall plateaus. Here we report a third type of the integer quantum Hall effect. Charge carriers in bilayer graphene have a parabolic energy spectrum but are chiral and exhibit Berry{\textquoteright}s phase 2pi affecting their quantum dynamics. The Landau quantization of these fermions results in plateaus in Hall conductivity at standard integer positions but the last (zero-level) plateau is missing. The zero-level anomaly is accompanied by metallic conductivity in the limit of low concentrations and high magnetic fields, in stark contrast to the conventional, insulating behavior in this regime. The revealed chiral fermions have no known analogues and present an intriguing case for quantum-mechanical studies.",
author = "Novoselov, {K. S.} and Edward McCann and Morozov, {S. V.} and Fal{\textquoteright}ko, {Vladimir I.} and Katsnelson, {M. I.} and U. Zeitler and D. Jiang and F. Schedin and Geim, {A. K.}",
year = "2006",
month = mar,
doi = "10.1038/nphys245",
language = "English",
volume = "2",
pages = "177--180",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "3",

}

RIS

TY - JOUR

T1 - Unconventional quantum Hall effect and Berry’s phase 2pi in bilayer graphene.

AU - Novoselov, K. S.

AU - McCann, Edward

AU - Morozov, S. V.

AU - Fal’ko, Vladimir I.

AU - Katsnelson, M. I.

AU - Zeitler, U.

AU - Jiang, D.

AU - Schedin, F.

AU - Geim, A. K.

PY - 2006/3

Y1 - 2006/3

N2 - There are known two distinct types of the integer quantum Hall effect. One is the conventional quantum Hall effect, characteristic of two-dimensional semiconductor systems, and the other is its relativistic counterpart recently observed in graphene, where charge carriers mimic Dirac fermions characterized by Berry’s phase pi, which results in a shifted positions of Hall plateaus. Here we report a third type of the integer quantum Hall effect. Charge carriers in bilayer graphene have a parabolic energy spectrum but are chiral and exhibit Berry’s phase 2pi affecting their quantum dynamics. The Landau quantization of these fermions results in plateaus in Hall conductivity at standard integer positions but the last (zero-level) plateau is missing. The zero-level anomaly is accompanied by metallic conductivity in the limit of low concentrations and high magnetic fields, in stark contrast to the conventional, insulating behavior in this regime. The revealed chiral fermions have no known analogues and present an intriguing case for quantum-mechanical studies.

AB - There are known two distinct types of the integer quantum Hall effect. One is the conventional quantum Hall effect, characteristic of two-dimensional semiconductor systems, and the other is its relativistic counterpart recently observed in graphene, where charge carriers mimic Dirac fermions characterized by Berry’s phase pi, which results in a shifted positions of Hall plateaus. Here we report a third type of the integer quantum Hall effect. Charge carriers in bilayer graphene have a parabolic energy spectrum but are chiral and exhibit Berry’s phase 2pi affecting their quantum dynamics. The Landau quantization of these fermions results in plateaus in Hall conductivity at standard integer positions but the last (zero-level) plateau is missing. The zero-level anomaly is accompanied by metallic conductivity in the limit of low concentrations and high magnetic fields, in stark contrast to the conventional, insulating behavior in this regime. The revealed chiral fermions have no known analogues and present an intriguing case for quantum-mechanical studies.

U2 - 10.1038/nphys245

DO - 10.1038/nphys245

M3 - Journal article

VL - 2

SP - 177

EP - 180

JO - Nature Physics

JF - Nature Physics

SN - 1745-2473

IS - 3

ER -