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O: Fachverband Oberflächenphysik

O 91: Poster Session VII: Scanning probe techniques: Method development II

O 91.3: Poster

Thursday, March 4, 2021, 10:30–12:30, P

Radio-frequency transmission to the junction of a scanning tunneling microscope — •Nafise Kalantari, Thomas Jürgens, Rene Woltmann, Manuel Gruber, Alexander Weismann, and Richard Berndt — Institut fur Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 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 (RF) voltage at the tunnel junction over a wide range of frequencies. To achieve constant amplitude the RF input power is adjusted to compensate for frequency dependent variations of the cable transmission. This approach relies on a precise determination of the RF transmission function. Here, we discuss the upgrade of a low-temperature STM with high-frequency cables and a superconducting magnet. In particular, we present the RF transmission achieved with 40 dB attenuation at maximum.

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