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Etude opto-électronique des mécanismes de relaxation des électrons de haute énergie dans les hétérostructures en graphène

Abstract : In this thesis we study the electron-phonon coupling in graphene and in particular theinfluence of the substrate in the aforementioned coupling. We want to quantify by optoelectronicalmeasurements the coupling between the phonon modes of the substrate. It might be the couplingwith Surface Phonon Polaritons (SPPs) in case of isotropic substrates as SiO2 or Hyperbolic PhononPolaritons (HPPs) in case of highly anisotropic substrates. We start by a review about the state of theart on electron phonon coupling in graphene. Then we introduce the different experimental methodsused during this thesis. We present experimental results on an graphene on SiO2 sample. We identifythe different coupling regimes and point out the necessity of working on ultra clean samples toinvestigate the high energy regimes. Finally we prensent experimental results on a graphene on BNsample where we identify a new coupling regime consisting in HPP emission in a Zener-Klein transportregime
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Simon Berthou. Etude opto-électronique des mécanismes de relaxation des électrons de haute énergie dans les hétérostructures en graphène. Physique [physics]. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCC133⟩. ⟨tel-02061991⟩

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