Scanning tunneling spectroscopy of Pb thin films [Elektronische Ressource] / vorgelegt von Michael Becker

Christian-Albrechts-Universität zu KielInstitut für Experimentelle und Angewandte PhysikDissertationzur Erlangung des akademischen GradesDoctor rerum naturaliumder Mathematisch-Naturwissenschaftlichen Fakultätder Christian-Albrechts-Universität zu KielScanning Tunneling SpectroscopyofPb Thin Filmsvorgelegt vonMichael Beckergeboren am 30.10.1975aus KielKiel, Oktober 2010AThis work was typeset in LT X.EReferent: Prof. Dr. Richard BerndtKorreferent/in: Prof. Dr. Michael BauerTag der mündlichen Prüfung: 13. Dezember 2010Zum Druck genehmigt: Kiel, 13. Dezember 2010gez. Dekan Prof. Dr. Lutz KippFor my beloved parents.vAbstractThepresentthesisdealswiththeelectronicstructure,workfunctionandsingle-atom contact conductance of Pb thin films, investigated with a low-temperaturescanning tunneling microscope.The electronic structure of Pb(111) thin films on Ag(111) surfaces is inves-tigated using scanning tunneling spectroscopy (STS). Quantum size effects, inparticular, quantum well states (QWSs), play a crucial role in the electronic andphysicalpropertiesofthesefilms[1,2]. Quantitativeanalysisofthespectrayieldsthe QWS energies as a function of film thickness, the Pb bulk-band dispersion inΓ-Ldirection, scatteringphaseshiftsatthePb/Aginterface andvacuumbarrier¯as well as the lifetime broadening at Γ.Theworkfunctionφisanimportantpropertyofsurfaces,whichinfluencescat-alytic reactivity and charge injection at interfaces.