Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies IV
O 43.5: Talk
Wednesday, March 20, 2024, 11:30–11:45, MA 004
Magnetic resonance imaging of single organic radicals on a surface — •Christoph Wolf1,2, Gregory Czap3, Jose Reina-Gálvez1,2, and Christopher P. Lutz3 — 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, 03760 Republic of Korea — 2Ewha Womans University, Seoul, 03760 Republic of Korea — 3IBM Research Division, Almaden Research Center, San Jose, CA, 95120 USA
The combination of electron spin resonance and scanning tunneling microscopy resulted in a versatile surface probe with sub-nm spatial and μeV energy resolution. In this work, we will show that this technique can be applied to characterize singly occupied molecular orbitals of organic radicals. We show the general applicability of this technique by applying it across a series of small fused hydrocarbons adsorbed on thin layers of magnesium oxide used to decouple the spins from the underlying silver substrate. We utilize ab initio calculation and transport simulations using non-equilibriums Green*s functions to explain spatial and spectral variation of the magnetic resonance signal. Our work is the first demonstration of magnetic resonance imaging of a single molecular orbital with sub-molecular resolution of an organic radical of a surface.
Keywords: Electron spin resonance; Scanning tunneling microscopy; Magnetic resonance imaging; Organic radicals; Non-equilibrium transport