Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Posters: Scanning Probe Methods
O 63.18: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P2
Electronic pump-probe experiments in STM using THz-pulses — •Steffen Rolf-Pissarczyk1,2, Jacob Burgess1,2, Deung-Jang Choi1,2, Shichao Yan1,2, and Sebastian Loth1,2 — 1Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg — 2Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany
Fast dynamics at picosecond timescales are full of interesting phenomena such as depinning of charge density waves, molecular vibrations or spin precession on surfaces. The challenge is to observe those effects on this timescale with atomic or nanometer spatial resolution. For this propose we combine a scanning tunneling microscope (STM) with ps THz-laser pulses. This technique couples directly to the STM tip with THz radiation instead of exciting the sample with optical pulses. This technique enables control of the electric field at the tunnel junction with the THz pulses independent to the nature of the sample. This generality allows exciting and probing a various number of systems. The experimental setup is similar to all-electronic pump-probe methods but without limitations imposed by the electrical bandwidth of wires. Progress on the new instrument is described and first measurements will be presented.