Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B21: Moire Beyond Magic-Angle I
11:30 AM–2:30 PM,
Monday, March 6, 2023
Room: Room 213
Sponsoring
Unit:
DCMP
Chair: Kevin Nuckolls, Princeton University
Abstract: B21.00009 : Intralayer and interlayer electron-phonon processes in twisted bilayer graphene investigated by resonance Raman spectroscopy*
1:06 PM–1:18 PM
Author not Attending
Presenter:
MARCOS A PIMENTA
(Universidade Federal de Minas Gerais)
Authors:
MARCOS A PIMENTA
(Universidade Federal de Minas Gerais)
Pedro Venezuela
(UFF Niteroi, RJ, Brazil)
Eliel Silva
(UFMG, Brazil)
Marcus V Moutinho
(UFRJ, Brazil)
Ariete Righi
(UFMG, Brazil)
Rafael N Gontijo
(UFMG, Brazil)
Thierry Michel
(Université de Montpellier, France)
Matthieu Paillet
(Universite de Montpellier, France)
Po-Wen Chiu
(NTHU, Taiwan)
interactions in twisted bilayer graphene structures. Raman spectroscopy is a fundamental tool to study twisted bilayer graphene (TBG) since the
Raman response is hugely enhanced when the photons are in resonance with optical transitions of
TBGs. Moreover, new peaks appear in the Raman spectra and are due to phonons within the
interior of the Brillouin zone of graphene that are activated by the Moire superlattice by either the
intralayer or the interlayer electron-phonon processes. I will present multiple-excitation
Raman results in many TBG samples with different twisting angles beyond the magic angle and using several different
laser excitation energies in the NIR, visible and UV ranges. The experimental results reveal two different resonance mechanisms enhance the new Raman peaks, involving intralayer and interlayer electron-phonon interaction. The behavior of phonons both from the acoustic and optic branches are explained by
theoretical calculations of the double-resonance (DR) Raman process in graphene, by imposing
the momentum conservation rules for the intralayer and the interlayer electron-phonon processes.
*The work was supported by Fapemig, CNPq, Brasil
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