SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: Poster Session I
HL 3.13: Poster
Monday, September 27, 2021, 10:00–13:00, P
Magnetotransport Measurements on Folded Twisted Bilayer Graphene-Hexagonal Boron Nitride Heterostructure — •Bei Zheng1, Lina Bockhorn1, Christopher Belke1, Sung Ju Hong2, and Rolf J. Haug1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany — 2Division of Science Education, Kangwon National University, Chuncheon, 24341, Republic of Korea
The transport properties of bilayer graphene are strongly depended on rotational mismatch between the two graphene sheets, owing to the energy band modulation from the corresponding Moiré superlattice [1,2]. Here, we focused on the magnetotransport characteristics of folded twisted bilayer graphene (fTBG) which was obtained by mechanical exfoliation and it’s heterostructure stacking with hexagonal boron nitride (hBN). The typical Landau fan diagrams from our hBN/fTBG/hBN sample were observed and the corresponding quantum Hall effect was investigated. Additional to the charge neutrality point (CNP), a local resistance peak which is independent of the perpendicular applied magnetic field was also distinguished. This could be attributed to the folded edge [1] that induces strong gauge fields [3] and exhibits different charge carrier densities.
[1] H. Schmidt et al., Nat. Commun. 5, 5742 (2014)
[2] J. C. Rode et al., 2D Mater. 3, 035005 (2016)
[3] D. Rainis et al., Phys. Rev. B 83, 265404 (2011).