Topologically non-trivial valley states in bilayer graphene quantum point contactsCitation formats

  • External authors:
  • Hiske Overweg
  • Thomas Fabian
  • L. Linhart
  • Peter Rickhaus
  • Lucien Wernli,
  • Kenji Watanabe
  • Takashi Taniguchi
  • David Sanchez
  • Joachim Burgdörfer
  • Florian Libisch
  • Klaus Ensslin
  • Thomas Ihn

Standard

Topologically non-trivial valley states in bilayer graphene quantum point contacts. / Overweg, Hiske; Knothe, Angelika; Fabian, Thomas ; Linhart, L.; Rickhaus, Peter; Wernli, Lucien ; Watanabe, Kenji; Taniguchi, Takashi; Sanchez, David; Burgdörfer, Joachim; Libisch, Florian; Fal'ko, Vladimir; Ensslin, Klaus; Ihn, Thomas.

In: Physical Review Letters, Vol. 121, No. 25, 257702, 20.12.2018.

Research output: Contribution to journalArticlepeer-review

Harvard

Overweg, H, Knothe, A, Fabian, T, Linhart, L, Rickhaus, P, Wernli, L, Watanabe, K, Taniguchi, T, Sanchez, D, Burgdörfer, J, Libisch, F, Fal'ko, V, Ensslin, K & Ihn, T 2018, 'Topologically non-trivial valley states in bilayer graphene quantum point contacts', Physical Review Letters, vol. 121, no. 25, 257702. https://doi.org/10.1103/physrevlett.121.257702

APA

Overweg, H., Knothe, A., Fabian, T., Linhart, L., Rickhaus, P., Wernli, L., Watanabe, K., Taniguchi, T., Sanchez, D., Burgdörfer, J., Libisch, F., Fal'ko, V., Ensslin, K., & Ihn, T. (2018). Topologically non-trivial valley states in bilayer graphene quantum point contacts. Physical Review Letters, 121(25), [257702]. https://doi.org/10.1103/physrevlett.121.257702

Vancouver

Overweg H, Knothe A, Fabian T, Linhart L, Rickhaus P, Wernli, L et al. Topologically non-trivial valley states in bilayer graphene quantum point contacts. Physical Review Letters. 2018 Dec 20;121(25). 257702. https://doi.org/10.1103/physrevlett.121.257702

Author

Overweg, Hiske ; Knothe, Angelika ; Fabian, Thomas ; Linhart, L. ; Rickhaus, Peter ; Wernli, Lucien ; Watanabe, Kenji ; Taniguchi, Takashi ; Sanchez, David ; Burgdörfer, Joachim ; Libisch, Florian ; Fal'ko, Vladimir ; Ensslin, Klaus ; Ihn, Thomas. / Topologically non-trivial valley states in bilayer graphene quantum point contacts. In: Physical Review Letters. 2018 ; Vol. 121, No. 25.

Bibtex

@article{e5a068b3b4854a65b9234d6c7ebb11f1,
title = "Topologically non-trivial valley states in bilayer graphene quantum point contacts",
abstract = "We present measurements of quantized conductance in electrostatically induced quantum point contacts in bilayer graphene. The application of a perpendicular magnetic field leads to an intricate pattern of lifted and restored degeneracies with increasing field: at zero magnetic field the degeneracy of quantized one-dimensional subbands is four, because of a twofold spin and a twofold valley degeneracy. By switching on the magnetic field, the valley degeneracy is lifted. Because of the Berry curvature, states from different valleys split linearly in magnetic field. In the quantum Hall regime fourfold degenerate conductance plateaus reemerge. During the adiabatic transition to the quantum Hall regime, levels from one valley shift by two in quantum number with respect to the other valley, forming an interweaving pattern that can be reproduced by numerical calculations.",
author = "Hiske Overweg and Angelika Knothe and Thomas Fabian and L. Linhart and Peter Rickhaus and Lucien Wernli, and Kenji Watanabe and Takashi Taniguchi and David Sanchez and Joachim Burgd{\"o}rfer and Florian Libisch and Vladimir Fal'ko and Klaus Ensslin and Thomas Ihn",
year = "2018",
month = dec,
day = "20",
doi = "10.1103/physrevlett.121.257702",
language = "English",
volume = "121",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "25",

}

RIS

TY - JOUR

T1 - Topologically non-trivial valley states in bilayer graphene quantum point contacts

AU - Overweg, Hiske

AU - Knothe, Angelika

AU - Fabian, Thomas

AU - Linhart, L.

AU - Rickhaus, Peter

AU - Wernli,, Lucien

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Sanchez, David

AU - Burgdörfer, Joachim

AU - Libisch, Florian

AU - Fal'ko, Vladimir

AU - Ensslin, Klaus

AU - Ihn, Thomas

PY - 2018/12/20

Y1 - 2018/12/20

N2 - We present measurements of quantized conductance in electrostatically induced quantum point contacts in bilayer graphene. The application of a perpendicular magnetic field leads to an intricate pattern of lifted and restored degeneracies with increasing field: at zero magnetic field the degeneracy of quantized one-dimensional subbands is four, because of a twofold spin and a twofold valley degeneracy. By switching on the magnetic field, the valley degeneracy is lifted. Because of the Berry curvature, states from different valleys split linearly in magnetic field. In the quantum Hall regime fourfold degenerate conductance plateaus reemerge. During the adiabatic transition to the quantum Hall regime, levels from one valley shift by two in quantum number with respect to the other valley, forming an interweaving pattern that can be reproduced by numerical calculations.

AB - We present measurements of quantized conductance in electrostatically induced quantum point contacts in bilayer graphene. The application of a perpendicular magnetic field leads to an intricate pattern of lifted and restored degeneracies with increasing field: at zero magnetic field the degeneracy of quantized one-dimensional subbands is four, because of a twofold spin and a twofold valley degeneracy. By switching on the magnetic field, the valley degeneracy is lifted. Because of the Berry curvature, states from different valleys split linearly in magnetic field. In the quantum Hall regime fourfold degenerate conductance plateaus reemerge. During the adiabatic transition to the quantum Hall regime, levels from one valley shift by two in quantum number with respect to the other valley, forming an interweaving pattern that can be reproduced by numerical calculations.

U2 - 10.1103/physrevlett.121.257702

DO - 10.1103/physrevlett.121.257702

M3 - Article

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 25

M1 - 257702

ER -