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Anomalous electrical transport in orientationally controlled trinary hybrids of graphene and twisted bilayer molybdenum disulphide

Sett, S and Kundu, S and Kakkar, S and Gill, NK and Jain, M and Ghosh, A (2021) Anomalous electrical transport in orientationally controlled trinary hybrids of graphene and twisted bilayer molybdenum disulphide. In: Bulletin of Materials Science, 44 (4).

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Official URL: https://doi.org/10.1007/s12034-021-02590-4


Moiré superlattices of two-dimensional (2D) materials oriented at low twist angles generate a large-scale interference pattern leading to strong interlayer coupling, which influences the band structure and introduces flatbands. Conventional electronic transport measurements have shown the effects of flatband physics, manifesting as correlated insulating states and emergent superconductivity. In this study, we probe the electronic states in a trinary hybrid of graphene and twisted bilayer (tbl) MoS2. Graphene acts as a sensing layer, which captures the electronic effects of the underlying substrate, and we observe certain anomalies in the electronic characteristics of graphene only in the presence of an underlying 58.5� tbl MoS2, at low temperatures. Interestingly, graphene on tbl MoS2, with twist angle near 0� or on natural bilayer MoS2, does not show any anomalies. Density functional theory calculations show several distinguishable peaks in the density of states at the conduction band edge of twisted MoS2 near 60�. We speculate that the anomaly appears due to fermi level pinning of graphene owing to a large density of states in the flatbands of twisted bilayer MoS2. An analysis of the energetics in the graphene-MoS2 hybrid quantitatively agree with theoretical predictions. © 2021, Indian Academy of Sciences.

Item Type: Journal Article
Publication: Bulletin of Materials Science
Publisher: Springer
Additional Information: The copyright for this article belongs to Springer
Keywords: Density functional theory; Layered semiconductors; Molybdenum compounds; Substrates; Sulfur compounds; Transition metals, Densities of state; Electrical transport; Flat band; Graphene bilayers; Large-scales; Moire superlattice; Transition metal dichalcogenides (TMD); Twist angles; Twisted bilayers; Two-dimensional, Graphene
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Dec 2021 05:51
Last Modified: 21 Dec 2021 05:51
URI: http://eprints.iisc.ac.in/id/eprint/70689

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