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Raman Excitation Profile of the G-band Enhancement in Twisted Bilayer Graphene

  • Condensed Matter
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Abstract

A resonant Raman study of twisted bilayer graphene (TBG) samples with different twisting angles using many different laser lines in the visible range is presented. The samples were fabricated by CVD technique and transferred to Si/SiO2 substrates. The Raman excitation profiles of the huge enhancement of the G-band intensity for a group of different TBG flakes were obtained experimentally, and the analysis of the profiles using a theoretical expression for the Raman intensities allowed us to obtain the energies of the van Hove singularities generated by the Moiré patterns and the lifetimes of the excited state of the Raman process. Our results exhibit a good agreement between experimental and calculated energies for van Hove singularities and show that the lifetime of photoexcited carrier does not depend significantly on the twisting angle in the range intermediate angles (𝜃 between 10∘ and 15∘). We observed that the width of the resonance window (Γ ≈ 250 meV) is much larger than the REP of the Raman modes of carbon nanotubes, which are also enhanced by resonances with van Hove singularities.

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Acknowledgements

This work was partially supported by Brazilian Institute of Science and Technology (INCT) in Carbon Nanomaterials and the Brazilian agencies Fapemig, CAPES and CNPq. The authors thank Profs. P. Venezuela and L. G. Cancado for helpful discussions. RS acknowledges MEXT grants (25107005 and 25286005).

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Authors and Affiliations

  1. Departamento de Fisica, UFMG, Belo Horizonte, Minas Gerais, Brazil

    G. S. N. Eliel, C. Fantini, A. Righi & M. A. Pimenta

  2. Departamento de Engenharia Eletrica, Universidade Presbiteriana Mackenzie, São Paulo, SP, Brazil

    H. B. Ribeiro

  3. National Institute of Technology, Sendai College, Sendai, Japan

    K. Sato

  4. Department of Physics, Tohoku University, Sendai, Japan

    R. Saito

  5. Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan

    Chun-Chieh Lu & Po-Wen Chiu

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  1. G. S. N. Eliel
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  2. H. B. Ribeiro
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  3. K. Sato
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  4. R. Saito
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  5. Chun-Chieh Lu
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  6. Po-Wen Chiu
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  7. C. Fantini
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  8. A. Righi
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  9. M. A. Pimenta
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Corresponding author

Correspondence to G. S. N. Eliel.

Additional information

This work was partially supported by Brazilian Institute of Science and Technology (INCT) in Carbon Nanomaterials and Brazilian agencies CAPES, CNPq. RS acknowledges MEXT grants (25107005 and 25286005).

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Eliel, G.S.N., Ribeiro, H.B., Sato, K. et al. Raman Excitation Profile of the G-band Enhancement in Twisted Bilayer Graphene. Braz J Phys 47, 589–593 (2017). https://doi.org/10.1007/s13538-017-0526-8

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  • DOI: https://doi.org/10.1007/s13538-017-0526-8

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