TY - JOUR

T1 - Strain-induced doping and zero line mode at the fold of twisted Bernal-stacked bilayer graphene

AU - Hong, Sung Ju

AU - Xiao, Xiao

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).

PY - 2021/10/18

Y1 - 2021/10/18

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.

AB - 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.

KW - Bernal stacking

KW - Folding

KW - Strain-induced doping

KW - Twisted double-bilayer graphene

KW - Zero line mode

UR - http://www.scopus.com/inward/record.url?scp=85114437931&partnerID=8YFLogxK

U2 - 10.1088/2053-1583/ac152e

DO - 10.1088/2053-1583/ac152e

M3 - Article

AN - SCOPUS:85114437931

VL - 8

JO - 2D Materials

JF - 2D Materials

SN - 2053-1583

IS - 4

M1 - 045009

ER -