Skip to Main content Skip to Navigation

Etude par spectroscopies d'électrons d'interfaces métalliques et semiconductrices

Abstract : This thesis is devoted to the electronic properties of low-dimensional systems based on metal and semiconducting materials. The first part deals with the Shockley state confinement in Ag(111) nanostructures, by means of very-low temperature (5 K) STM/STS measurements. We study the electronic structure and spatial distribution of the confined modes. Then the discrete nature of the electronic spectrum allows one to yield the quasiparticule lifetime. A Fermi-liquid behaviour is evidenced and we show that the dominant decay mechanism is attributed to the electron-phonon coupling. The extrinsic contribution arising from the partial confinement of the electronic wave is obtained as well. A scaling law with the nanostructure width is demonstrated, from which we deduce a higher reflection amplitude than in monoatomic islands. In the second part of the thesis, we study semiconducting ultra-thin films produced by alkali (K, Rb, Cs) deposition on the Si(111):B-[root of]3 surface. This work solves the controversy concerning the ground state of this system, and especially the nature of the 2[root of]3 surface recontruction obtained at saturation coverage. Prior understanding of the crystallographic structure allows to elucidate the electronic properties. We show that a one-electron picture, leading to a band insulator scenario, gives a good description of the system, in spite of strong polaronic effects. This conclusion results from an in-depth, combined study of complementary techniques (LEED, ARPES, XPS, STM/STS and DFT calculations).
Complete list of metadata

Cited literature [173 references]  Display  Hide  Download
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 10:29:26 AM
Last modification on : Thursday, February 25, 2021 - 11:04:56 AM
Long-term archiving on: : Thursday, September 13, 2018 - 12:04:22 PM


Files produced by the author(s)


  • HAL Id : tel-01746263, version 1


Cédric Tournier-Colletta. Etude par spectroscopies d'électrons d'interfaces métalliques et semiconductrices. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10109⟩. ⟨tel-01746263⟩



Record views


Files downloads