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Theme 1 colloquium by Manuel Steinbrecher: 'Electron spin resonance of an individual atom at mK temperature in a vector magnetic field' (Lecture)

Tuesday 3 December 2019Add to my calendar
from 16:00
Manuel Steinbrecher - Scanning Probe Microscopy

It was recently shown that electron spin resonance (ESR) can be combined with 007_manuel-portrait-nijmegen_14-06-2018spin-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)
[3] H. v. Allwörden et al., RSI 89, 033902 (2018)

Joost Bakker / Gilles de Wijs