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Etude des propriétés électroniques des états de Shockley dans les surfaces nanostructurées auto-organisées

Abstract : We present in this study the investigation of the electronic properties of Shockley states in nanostructured systems by Angular Resolved Photoelectron Spectroscopy and Scanning Tunnelling Spectroscopy. After previous works demonstrating the electronic confinement induced by the periodical potential associated to the array of steps on Au(788) and Au(23 23 21) vicinal faces, here we report spectroscopic effects induced by the surface reconstruction on these electronic states. Despite the weak amplitude of the electronic potential associated to the surface reconstruction, we highlighted the Bragg diffraction induced by the super-periodicity of the potential, which lead to gaps opening and modulation of electronic density. Moreover we propose an original method to deduce the electronic potential of these surfaces by exploiting experimental data of both complementary techniques. We also show that we can produce bidimensional array of metallic nanostructures by using the preferential nucleation sites naturally present on these reconstructed vicinal surfaces. The study of the silver?s growth at low temperature allowed us to obtain a very well-ordered array of nanostructures at large scale and which exhibit a very sharp distribution of the island?s size. By controlling the characteristical dimensions of the array and the chemical nature of nanostructures, we show that in addition to structure the electronic density of the surface at nanometric scale, we can modify with an excellent homogeneity on the whole surface the localisation of the maxima of density of states and their characteristical energies around Fermi level.
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https://hal.univ-lorraine.fr/tel-01748263
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  • HAL Id : tel-01748263, version 1

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Clément Didiot. Etude des propriétés électroniques des états de Shockley dans les surfaces nanostructurées auto-organisées. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10133⟩. ⟨tel-01748263⟩

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