Spatially Resolved Spectroscopy on Carbon Nanotubes.

摘要

This thesis describes a number of experiments performed with low temperature scanning tunneling microscopes. In chapter 2 the physical mechanism and technical aspects of STM are explained. The design and testing of a milli Kelvin STM, on the superconductor NbSe(sub 2), is discussed in chapter 3. The electronic properties of carbon nanotubes are described in chapter 4 followed by chapter 5, in which the first STM observations on these molecules are reviewed. More specific studies on carbon nanotube buckles and crossed carbon nanotubes are presented in chapters 6 and 7. The observation of a suppression in the differential conductance at zero bias on carbon nanotubes is the subject of chapter 8 and possible explanations for this suppression are discussed. Chapters 9 and 10 provide a nice illustration of using carbon nanotubes as a model system to study fundamental physics. The textbook problem of a particle in a box is experimentally realized and the shape of the wave functions is measured.