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Lecture Kai-Felix Braun


16 May 2007 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. Kai-Felix Braun
Affiliation:Universitaet Hamburg, Germany
Title:Atomic and molecular engineering with a scanning tunnelling microscope
Date:Wed May 16, 2007
Location:FWN-Building 5116.0116
Host:P. Rudolf
Telephone:+31 50 363 4736


Nanotechnology advances rapidly and is going to ever decreasing length scale. By going from simple to more complex structures is one possible approach which will be presented in this talk. The controlled manipulation of single atoms and molecules is an important technique and can be done with scanning probe instruments. Low-temperature scanning tunnelling microscopy (LT-STM) is capable of manipulating adsorbed atoms and molecules with atomic-scale precision. Such approach makes LT-STM a powerful experimental tool to explore fundamental electronic processes in nanoscale model systems. Recent results show the built-up of atomic structures and the investigation of the involved interaction forces. In this talk a formula to measure the force needed to move a single atom across a surface will be presented. Additionally to that it will be shown that noble metal and magnetic surfaces display considerable differences, where adsorbed atoms can even be pushed away. Another application of LT-STM presented in this talk is the investigation of organometallic polymers with magnetic properties which has received considerable interest over the past two decades. In view of the development of molecular electronics metallocene molecules are expected to exhibit unique properties e. by using magnetic atoms to exploit spin dependent effects or for the production of metal-molecule layers. The growth of highly ordered films, or ultrathin molecular crystals gave insight into chemical and biological processes and the physical processes occurring in organic luminescence displays and solar cells.
Last modified:22 October 2012 2.30 p.m.