Correlation of electronic transport and structure in Pb atomic wires on Si(557) surfaces [Elektronische Ressource] / von Marcin Czubanowski

Correlation of electronictransport and structure in Pbatomic wires on Si(557) surfacesVon der Fakult at fur Mathematik und Physikder Gottfried Wilhelm Leibniz Universit at Hannoverzur Erlangung des GradesDoktor der NaturwissenschaftenDr. rer. nat.genehmigte DisertationvonDipl.-Phys. Marcin Czubanowskigeboren am 24. Oktober 1978 in Posen20092Referent: Prof. Dr. H. PfnurKorreferent: PD Dr. C. TegenkampTag der Promotion: 29.06.20093Keywords: One dimensional Pb-wires, conductance in low dimension, SPA-LEEDSchlagw orter: Eindimensionale Pb-Dr athe, Leitf ahigkeit von den niedrigdimen-sionalen Strukturen, SPA-LEED4AbstractOne dimensional electron systems are very interesting because they exhibit a wealthof interesting physical phenomena, such as the quantization of conductance, Peierlsinstability, Fermi or Luttinger liquids behavior. These e ects have been intensivelystudied with respect to structure and electronic con guration as both are related toeach other. The Pb/Si(557) system, which is the subject of this thesis, manifestsa phase transition for a Pb coverage of 1.31 ML. This phase transition is observedat temperatures as low as T = 78K and switches between two states. In the highctemperature state, the conductivity is thermally activated and has very low anisotropy.For the low temperatures, the conductivity switches into high anisotropy state (a factorof 60).