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Propriétés électroniques locales de nanostructures métalliques: Etats de surface et effets de confinement

Abstract : This work is devoted to an experimental study of metallic surfaces by scanning tunneling microscopy (STM). Some surfaces of noble metals and iron or nickel exhibit electronic states, localized near the surface, which may be either spin-splitted or non-magnetic and strongly or weakly dispersive. We take advantage of the spatial resolution of the STM to analyse the atomic structure of the surfaces as well as to locate and/or to create a unique nanoscale structure in order to study its electronic properties by tunneling conductance measurements. Eventually, this kind of nano-islands shows up electronic confinement that leads to quantum interferences detected by STM as electronic standing waves. First, the theoretical physical properties of the surface states (known as “Shockley Surface States”) are presented including a description of their scattering process with static surface defects. Then, we apply a method that seems to be the most efficient to perform local magnetic measurements and we present some preliminary results on the system made of a thin iron film on Ag(001). Another magnetic surface, Ni(111), is studied. Its electronic properties are characterized by analysing the quantum interference patterns associated to a nanoscale island of Ni on Ni(111) fabricated by indentation. The last part is dedicated to the deposition of Ni on Cu(111). This study is related to the chemical composition of the surface and mainly to the electronic properties of nanoscale nickel and copper structures. Finally, we discuss the effect of the chemical composition of these nanostructures on their electronic properties.
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Contributor : Stéphane Pons <>
Submitted on : Thursday, March 6, 2003 - 11:05:50 AM
Last modification on : Tuesday, November 24, 2020 - 3:34:03 PM
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  • HAL Id : tel-00002514, version 1




Stéphane Pons. Propriétés électroniques locales de nanostructures métalliques: Etats de surface et effets de confinement. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2002. Français. ⟨tel-00002514⟩



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