Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 23: Poster Session - Electron-Driven Processes at Surfaces and Interfaces

O 23.2: Poster

Monday, March 16, 2020, 18:15–20:00, P1A

Transmission of radio-frequency voltages to the tunneling junction of a scanning tunneling microscope — •Nafise Kalantari, Thomas Jürgens, Rene Woltmann, Alexander Weismann, Rirchard Berndt, and Manuel Gruber — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany

Electron spin resonance scanning tunneling microscopy (ESR-STM), as implemented by Baumann et al. [1], requires the application of a constant-amplitude radio frequency voltage at the tunnel junction over a wide range of frequencies (DC-40GHz). The constant amplitude is achieved by tuning the radio-frequency input power to compensate the variation of the transmission of the voltage line as a function of frequency [2]. However, this requires a precise determination of the radio-frequency transmission function. Here, we discuss the upgrade of a low-temperature STM with high-frequency cables and a superconducting magnet. The radio-frequency voltage applied to the tunneling junction has been measured for different frequencies to evaluate the transmission of the voltage line.

[1] S. Baumann, W. Paul, T. Choi, C. P. Lutz, A. Ardavan, A. J. Heinrich, Science 350, 417-420 (2015).

[2] W. Paul, S. Baumann, C. P. Lutz, A. J. Heinrich, Rev. Sci. Instrum. 87, 074703 (2016).