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Raman spectroscopy of graphene under ultrafast laser excitation

Author

Listed:
  • C. Ferrante

    (Universitá di Roma La Sapienza”
    Center for Life Nano Science @Sapienza)

  • A. Virga

    (Universitá di Roma La Sapienza”
    Center for Life Nano Science @Sapienza)

  • L. Benfatto

    (CNR, UoS Sapienza)

  • M. Martinati

    (Universitá di Roma La Sapienza”)

  • D. De Fazio

    (University of Cambridge)

  • U. Sassi

    (University of Cambridge)

  • C. Fasolato

    (Universitá di Roma La Sapienza”)

  • A. K. Ott

    (University of Cambridge)

  • P. Postorino

    (Universitá di Roma La Sapienza”)

  • D. Yoon

    (University of Cambridge)

  • G. Cerullo

    (Politecnico di Milano)

  • F. Mauri

    (Universitá di Roma La Sapienza”
    Center for Life Nano Science @Sapienza)

  • A. C. Ferrari

    (University of Cambridge)

  • T. Scopigno

    (Universitá di Roma La Sapienza”
    Center for Life Nano Science @Sapienza)

Abstract

The equilibrium optical phonons of graphene are well characterized in terms of anharmonicity and electron–phonon interactions; however, their non-equilibrium properties in the presence of hot charge carriers are still not fully explored. Here we study the Raman spectrum of graphene under ultrafast laser excitation with 3 ps pulses, which trade off between impulsive stimulation and spectral resolution. We localize energy into hot carriers, generating non-equilibrium temperatures in the ~1700–3100 K range, far exceeding that of the phonon bath, while simultaneously detecting the Raman response. The linewidths of both G and 2D peaks show an increase as function of the electronic temperature. We explain this as a result of the Dirac cones’ broadening and electron–phonon scattering in the highly excited transient regime, important for the emerging field of graphene-based photonics and optoelectronics.

Suggested Citation

  • C. Ferrante & A. Virga & L. Benfatto & M. Martinati & D. De Fazio & U. Sassi & C. Fasolato & A. K. Ott & P. Postorino & D. Yoon & G. Cerullo & F. Mauri & A. C. Ferrari & T. Scopigno, 2018. "Raman spectroscopy of graphene under ultrafast laser excitation," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02508-x
    DOI: 10.1038/s41467-017-02508-x
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    Cited by:

    1. Yang Luo & Alberto Martin-Jimenez & Michele Pisarra & Fernando Martin & Manish Garg & Klaus Kern, 2023. "Imaging and controlling coherent phonon wave packets in single graphene nanoribbons," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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