Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.17: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Development of a Scanning Tunneling Microscope for measurements below 100mK — •Maximilian Assig, Fabian Zinser, Wolfgang Stiepany, Andreas Koch, Peter Andler, Christian R. Ast, and Klaus Kern — Max-Planck-Institut für Festkörperforschung,

The investigation of novel physical phenomena implies the design and the construction of new setups and measurement techniques, which can break through instrumental limitations and open new areas in measurement accuracy. Scanning Tunneling Microscopy (STM) is a technique for probing the electronic structure of single adsorbed atoms and nanostructures at surfaces with atomic resolution. As the energy resolution increases with decreasing temperature, cooling the STM below 100mK results in an energy resolution which is better than 24µeV. To achieve this goal, we want to connect a home-built STM to the mixing chamber of a custom-designed bottom-loading dilution cryostat. Tip and sample can be transferred directly from the preparation chamber into the STM without breaking the ultra high vacuum (UHV), which allows in situ sample preparation. Measurements can be performed in high magnetic fields of 14T perpendicular and 500mT parallel to the sample surface. We present design and concept of the STM as well as milestones in the project realization.