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Article Dans Une Revue Physical Review B Année : 2020

Fermi resonance in the Raman spectrum of graphene

Résumé

We report the observation of an intense anomalous peak at 1608 cm −1 in the Raman spectrum of graphene associated with the presence of chromium nanoparticles in contact with graphene. Bombardment with an electron beam demonstrates that this peak is distinct from the well-studied D peak appearing as defects are created in graphene; this peak is found to be nondispersive. We argue that the bonding of chromium atoms with carbon atoms softens the out-of-plane optical (ZO) phonon mode, in such a way that the frequency of its overtone decreases to 2ω ZO ∼ ω G , where ω G = 1585 cm −1 is the frequency of the Raman-active E 2g mode. Thus, the observed peak is attributed to the 2ZO mode which becomes Raman active following a mechanism known as Fermi resonance. First-principles calculations of the vibrational and anharmonic properties of the graphene/Cr interface support this scenario.
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Dates et versions

hal-03004723 , version 1 (13-11-2020)

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Dipankar Kalita, Michele Amato, Alexandre Artaud, Läetitia Marty, Vincent Bouchiat, et al.. Fermi resonance in the Raman spectrum of graphene. Physical Review B, 2020, 102 (7), pp.075436. ⟨10.1103/PhysRevB.102.075436⟩. ⟨hal-03004723⟩
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