Strain-induced doping and zero line mode at the fold of twisted Bernal-stacked bilayer graphene

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

Externe Organisationen

  • Technische Universität Braunschweig
  • Korea Basic Science Institute
  • Seoul National University
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Details

OriginalspracheEnglisch
Aufsatznummer045009
Fachzeitschrift2D Materials
Jahrgang8
Ausgabenummer4
PublikationsstatusVeröffentlicht - 18 Okt. 2021

Abstract

The folding of Bernal-stacked bilayer graphene leads to electronic devices that can be understood as combinations of a twisted double-bilayer graphene and a fold. In magnetotransport experiments contributions of the two different parts can be identified. For the twisted double-bilayer graphene Landau fan diagrams with satellite fans depending on twist angle are observed. The fold gives rise to a local minimum in conductance which does not shift with applied perpendicular magnetic field. Regardless of twist angle the fold favors electron doping attributed to compressive strain at the kink geometry. The curvature of the folded structure provides for a systematic explanation, which is also in agreement with the observed correlation between twist angle and interlayer distance. Finally, the appearance of the topological zero line mode formed at the fold is discussed.

ASJC Scopus Sachgebiete

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Strain-induced doping and zero line mode at the fold of twisted Bernal-stacked bilayer graphene. / Hong, Sung Ju; Xiao, Xiao; Wulferding, Dirk et al.
in: 2D Materials, Jahrgang 8, Nr. 4, 045009, 18.10.2021.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Hong SJ, Xiao X, Wulferding D, Belke C, Lemmens P, Haug RJ. Strain-induced doping and zero line mode at the fold of twisted Bernal-stacked bilayer graphene. 2D Materials. 2021 Okt 18;8(4):045009. doi: 10.1088/2053-1583/ac152e
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abstract = "The folding of Bernal-stacked bilayer graphene leads to electronic devices that can be understood as combinations of a twisted double-bilayer graphene and a fold. In magnetotransport experiments contributions of the two different parts can be identified. For the twisted double-bilayer graphene Landau fan diagrams with satellite fans depending on twist angle are observed. The fold gives rise to a local minimum in conductance which does not shift with applied perpendicular magnetic field. Regardless of twist angle the fold favors electron doping attributed to compressive strain at the kink geometry. The curvature of the folded structure provides for a systematic explanation, which is also in agreement with the observed correlation between twist angle and interlayer distance. Finally, the appearance of the topological zero line mode formed at the fold is discussed.",
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AU - Wulferding, Dirk

AU - Belke, Christopher

AU - Lemmens, Peter

AU - Haug, Rolf J.

N1 - Funding Information: This work is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany?s Excellence Strategy?EXC 2123 Quantum Frontiers?390837967 and within priority program SPP 2244 ?2DMP?, by the state of Lower Saxony via the School for Contacts in Nanosystems and Fundamentals of Physics and Metrology Initiative. Part of this study has been performed using facilities at the LNQE, Leibniz Universit?t Hannover, Germany. P L and D W acknowledge support from QUANOMET-NL4 and the Institute for Basic Science (IBS-R009-Y3).

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N2 - The folding of Bernal-stacked bilayer graphene leads to electronic devices that can be understood as combinations of a twisted double-bilayer graphene and a fold. In magnetotransport experiments contributions of the two different parts can be identified. For the twisted double-bilayer graphene Landau fan diagrams with satellite fans depending on twist angle are observed. The fold gives rise to a local minimum in conductance which does not shift with applied perpendicular magnetic field. Regardless of twist angle the fold favors electron doping attributed to compressive strain at the kink geometry. The curvature of the folded structure provides for a systematic explanation, which is also in agreement with the observed correlation between twist angle and interlayer distance. Finally, the appearance of the topological zero line mode formed at the fold is discussed.

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