SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Spins on Surfaces at the Atomic Scale II
O 15.11: Vortrag
Montag, 27. März 2023, 17:30–17:45, REC C 213
Orbital and spin excitations of hydrogenated titanium modulated by electric field — •Daria Sostina1, Lukas Arnhold2, Nicolaj Betz2, Susanne Baumann2, Philip Willke3, Wolfgang Wernsdorfer3, and Sebastian Loth2 — 1Institute of Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Karlsruhe, Germany — 2University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 3Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany
The goal for coherent control of individual spins on surfaces has prompted the development of new local probe techniques such as a combination of electron spin resonance (ESR) with scanning tunneling spectroscopy (STM). Yet, the excitation mechanism of ESR in STM is not conclusively determined. [Baumann et.al, Science 350, 6259, 2015, Ferron et. al, Phys. Rev. Research 1, 033185 (2019)]. Here we study a higher order orbital excitation of hydrogenated titanium complexes positioned on the oxygen site of the MgO surface. We observe a strong dependence of its excitation energy on the electric field generated by the STM tip. At the same time an ESR transition on that TiH exhibits a shift with the DC bias voltage applied to the junction which was attributed to a change in g-factor of the complex [Kot et. al, arXiv 2209.10969, 2022]. The ability to tune orbital and spin excitations by means of electric fields gives further insight on new pathways for electrical control of single spins centers on surfaces.