Infrared spectroscopy of one-dimensional metallic nanostructures on silicon vicinal surfaces [Elektronische Ressource] / put forward by Chung Vu Hoang

Dissertationsubmitted to theCombined Faculties of theNatural Sciences and Mathematics of theRuperto-Carola-University of Heidelberg, Germanyfor the degree ofDoctor of Natural SciencesPut forward byChung Vu Hoang, M.Scborn in Thanh Hoa, VietnamrdOral examination: June 23 2010Infrared Spectroscopy ofOne-dimensional MetallicNanostructures on SiliconVicinal SurfacesReferees: Prof.Dr. Annemarie PucciPriv.-Doz.Dr. Maarten F.M. DeKievietInfrared Spectroscopy of One-dimensional Metallic Nanostruc-tures on Silicon Vicinal Surfaces – Vicinal silicon (111) surfaces are usedas templates for the growth of lead nanowires as well as gold and indium atomchains. The morphology of the Au atom chains was studied by use of ScanningTunneling Microscopy (STM) and Reflection High Energy Electron Diffraction(RHEED). The In chains were investigated by infrared spectroscopy with theelectrical field component of the IR light polarized either parallel or perpendicularto the wires. It is shown that at room temperature, In atom-chains display aplasmonic absorption feature along the chain but not in the perpendicular direction.Furthermore, upon cooling down to liquid nitrogen temperature, a metal to insula-tor transition is observed. A structural distortion is also confirmed by RHEED.