Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Scanning Probe Techniques I: STM-ESR and Method Development (joint session O/CPP)

O 72.3: Vortrag

Mittwoch, 18. März 2020, 15:30–15:45, TRE Ma

Electron spin resonance of an individual atom at mK temperature in a vector magnetic field — •Manuel Steinbrecher1, Werner v. Weerdenburg1, Jan W. Gerritsen1, Niels v. Mullekom1, Fabian D. Natterer2, and Alexander A. Khajetoorians11Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands — 2Department of Physics, University of Zurich, CH-8057 Zurich, Switzerland

It was recently shown that electron spin resonance (ESR) can be combined with spin-resolved scanning tunneling microscopy (STM) to quantify the resonant excitations of individual 3d transition metal atoms [1]. The combination of atomic-resolution and ultra-high energy resolution, compared to standard scanning tunneling spectroscopy, has e.g. enabled quantification of the hyperfine coupling of individual atoms at temperatures near 1K [2]. Nevertheless, probing small absolute energy scales down to MHz frequencies requires the implementation of this method at much lower temperature. We will present ESR performed in a home-made dilution refrigerator (T = 30mK) based spin-polarized STM including a vector magnet [3]. The ESR was recorded on individual atoms on a thin insulating film of MgO over a whole frequency range from several hundred MHz to tens of GHz. A vector magnetic field was applied and allowed ESR experiments in different crystallographic directions.

[1] S. Baumann et al., Science 350, 417 (2015)
[2] P. Willke et al., Science 362, 336 (2018)
[4] H. v. Allwörden et al., RSI 89, 033902 (2018)

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