Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.21: Poster
Wednesday, March 20, 2024, 18:00–20:30, Poster E
Anisotropic transport in 1D Bilayer Graphene Superlattices — •Julia Amann1, Kenji Watanabe2, Takashi Taniguchi2, Dieter Weiss1, and Jonathan Eroms1 — 1University of Regensburg, Germany — 2National Institute for Materials Science, Tsukuba, Japan
One-dimensional superlattices (1DSLs) in graphene have been predicted to show intriguing effects, such as transport anisotropy, additional Dirac points and a distorted Fermi contour. In contrast to two-dimensional graphene superlattices, which have been widely studied, only very few experiments on 1DSLs have been reported. We use a patterned few-layer graphene gate underneath an encapsulated bilayer graphene to create a 1DSL. With the combined action of a global gate and a patterned bottom gate we can control superlattice potential strength and charge carrier density independently. We show low temperature transport measurements on a gate tunable 1DSL in bilayer graphene with a period of 50 nm in directions parallel and perpendicular to the modulation as we use a L-shaped Hallbar. We observe anisotropic transport in x and y directions and the appearance of multiple Dirac points in the modulation direction. These extra Dirac points are represented as additional Landau fans in magnetotransport. Furthermore, Weiss-oscillations are observed confirming the 1DSL modulation and the anisotropy.
Keywords: Graphene; Superlattice; Weiss oscillations; Commensurability oscillations