Colóquios da Nano – Electron-phonon processes in twisted bilayer graphene and low symmetry 2D materials investigated by Raman spectroscopy – Prof. Dr. Marcos A. Pimenta (UFMG)

• Responsável: Pós-graduação em nanociências e materiais avançados
• Câmpus: Evento Virtual
• Local: nano.ufabc.edu.br/coloquios
• Data: 26/07/2022
• Horário: 16:30 às 18:00
• Descrição:

  Palestrante: Prof. Dr. Marcos A Pimenta (UFMG)
  Título: Electron-phonon processes in twisted bilayer graphene and low symmetry 2D materials investigated by Raman spectroscopy
  Data: 26/07/2022

  Resumo: I will discuss the use of Raman spectroscopy to study electron-phonon interactions in 2D materials, focusing on twisted bilayer graphene (TBG) and anisotropic 2D materials. I will first present multiple-excitation Raman results in many different TBG samples with twisting angles and using several different laser excitation energies and explain the results by theoretical calculations of the double-resonance (DR) Raman intensity in graphene by imposing the momentum conservation rules for the intralayer and the interlayer electron-phonon processes. I will then present angle-resolved polarized Raman measurements in single-layer (1L) and bulk ReSe2, crystals that exhibit a triclinic symmetry, using two different laser excitation energies, in order to investigate the effects of dimensionality and excitation energy on the Raman tensors of ReSe2.

• Necessita inscrição: Não
• Link de divulgação: nano.ufabc.edu.br/coloquios

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