Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.41: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
A scanning tunneling microscope exhibiting 120 ps time resolution — •Christian Saunus, Marco Pratzer, and Markus Morgenstern — II. Physikalisches Institut B and JARA-FIT, RWTH Aachen University, D-52074 Aachen, Germany
Short tunneling voltage pulses are used in a pump-probe set-up to increase the time resolution of STM measurements, thereby beating the bandwidth limit of the current preamplifier.[1] Using a home built radio frequency STM, we apply voltage pulses as short as 120 ps to the tunneling junction between tip and sample. This is verified by measuring the overlap of pump and probe visible due to the non-linearity of the I-V characteristic of the junction measured independently. Atomic resolution on HOPG is achieved in the pump-probe mode exploiting differences in the non-linearity of I(V) which basically corresponds to a d2I/dV2 mapping on HOPG.
[1] S. Loth, M. Etzkorn, C. P. Lutz, D.M. Eigler, and A. J. Heinrich, Science 329, 1628 (2010).