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Twisted multilayer graphene exhibiting strong absorption bands induced by van Hove Singularities

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Abstract

Twisted bilayer graphene exhibits several angle-dependent properties due to the emergence of the van Hove Singularities in its density of states. Among them, twist-angle-dependent optical absorption has gained a lot of attention due to its presence in the visible spectral region. However, observation of such absorption is experimentally tricky due to large transmittance. In this study, we use highly decoupled twisted multilayer graphene to observe such absorption in the visible region using a simple spectrometer. A large number of twisted graphene layers in the system enable observation of such absorption evident in the visible region; the absorption band position correlates with the twist angle measured using selective area electron diffraction pattern as well as predictions from theory. While the Raman spectra were akin to those of the decoupled graphene system, at specific twist angle of \({\sim }13^{\circ }\), the spectrum contained clear signatures of G-band enhancement.

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Acknowledgements

We thank Prof C N R Rao for his constant encouragement and support. This research work is supported by Department of Science and Technology (DST), New Delhi, India. UM acknowledges IGSTC project for the fellowship.

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Authors and Affiliations

  1. Centre for Nano and Soft Matter Sciences, Jalahalli P.O., Bangalore, 560013, India

    Umesha Mogera & Giridhar U Kulkarni

  2. On lien from Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, 560064, India

    Giridhar U Kulkarni

Authors
  1. Umesha Mogera
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  2. Giridhar U Kulkarni
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Correspondence to Giridhar U Kulkarni.

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Mogera, U., Kulkarni, G.U. Twisted multilayer graphene exhibiting strong absorption bands induced by van Hove Singularities. Bull Mater Sci 41, 130 (2018). https://doi.org/10.1007/s12034-018-1648-5

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