Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2

O 71.2: Vortrag

Donnerstag, 8. September 2022, 15:30–15:45, S051

Modeling the Electron Spin Resonance Spectrum in Scanning Tunneling Microscopy — •Christian R. Ast¹, Piot Kot¹, Maneesha Ismail¹, and Juan Carlos Cuevas² — ¹MPI for Solid State Research, 70569 Stuttgart — ²Universidad Autónoma de Madrid, 28049 Madrid, Spain

The theory of electron spin resonance (ESR) spectroscopy in scanning tunneling microscopy (STM) has been debated for some time now with a number of different proposals having different origin, but essentially leading to very similar results. While the focus so far has been on the ESR signal itself, the measured DC tunneling spectrum offers more details that allow for a more precise verification of the underlying theory. Here, we discuss the ESR signal from a theory point of view by allowing the tunneling electrons to interact with both the driven spin system and the incident microwave during the tunneling process. We find a more complete description of the whole tunneling current also going beyond the typical approximation of a constant density of states.