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

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Abstract

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\(^\circ\) tbl MoS2, at low temperatures. Interestingly, graphene on tbl MoS2, with twist angle near 0\(^\circ\) 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\(^\circ\). 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.

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Acknowledgement

We acknowledge financial support from the U.S. Army International Technology Centre Pacific (ITC-PAC) and Ministry of Electronics and Information Technology, Government of India, as well as the Supercomputer Education and Research Centre (SERC) at IISc, for providing computational resources. SS acknowledges Aditya Jayaraman for fruitful discussions during the development of the work.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Science, Bangalore, 560012, India

    Shaili Sett, Sudipta Kundu, Saloni Kakkar, Navkiranjot Kaur Gill, Manish Jain & Arindam Ghosh

  2. Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India

    Arindam Ghosh

Authors
  1. Shaili Sett
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  2. Sudipta Kundu
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  3. Saloni Kakkar
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  4. Navkiranjot Kaur Gill
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  5. Manish Jain
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  6. Arindam Ghosh
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Correspondence to Shaili Sett.

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This article is part of the special issue on ‘Quantum materials and devices’.

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Sett, S., Kundu, S., Kakkar, S. et al. Anomalous electrical transport in orientationally controlled trinary hybrids of graphene and twisted bilayer molybdenum disulphide. Bull Mater Sci 44, 280 (2021). https://doi.org/10.1007/s12034-021-02590-4

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  • DOI: https://doi.org/10.1007/s12034-021-02590-4

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