Electron-Phonon Interaction in Graphene/Polar Substrate Interface - Mahdouani-Bourguiga, Mounira
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This work focuses on the study of two processes; Auger and Diffusion of an electron-surface optical phonon (ESOP) in monolayer graphene on polar substrates such as silicon dioxide, silicon carbide, hafnium oxide, or hexagonal boron nitride. We showed that; charge carrier relaxation channels are affected when deposing graphene on polar substrates. Thus, the fundamental physical mechanisms controlling the ultra-fast dynamics in graphene are influenced by the choice of polar substrate, temperature, charge carrier density, and the thickness of the graphene/polar substrate interface. The…mehr

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Produktbeschreibung
This work focuses on the study of two processes; Auger and Diffusion of an electron-surface optical phonon (ESOP) in monolayer graphene on polar substrates such as silicon dioxide, silicon carbide, hafnium oxide, or hexagonal boron nitride. We showed that; charge carrier relaxation channels are affected when deposing graphene on polar substrates. Thus, the fundamental physical mechanisms controlling the ultra-fast dynamics in graphene are influenced by the choice of polar substrate, temperature, charge carrier density, and the thickness of the graphene/polar substrate interface. The significant role of collinear and ultrafast scattering, enabling Auger processes, including charge multiplication, is a key to improving photovoltaic production and high sensitivity photo-detectors. In addition, we have shown that surface phonons of polar substrates produce an electric field that interacts with the electrons of the monolayer graphene deposited above. Indeed, the ESOP interaction causes a resonant coupling between the electron sublevels and the surface vibration modes inducing the increase of the Rabi splitting of the electrons energy levels in monolayer graphene on polar dielectrics.
Autorenporträt
Mounira Mahdouani-Bourguiga: Docteur en Physique. Actuellement enseignante à l''IPEIB et chercheur au Laboratoire Physique des Matériaux à la Faculté des Sciences de Bizerte-Tunisie. Ses recherches sont axées sur l''étude des propriétés optiques dans les nanoparticules de silicium et de germanium enfouies dans une matrice de silice.