Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies III
O 21.8: Vortrag
Dienstag, 19. März 2024, 12:30–12:45, MA 004
Manipulation of Orbital States on Titanium Atoms on MgO/Ag(100) — •Susanne Baumann1, Daria Sostina2, Lukas Arnhold1, Fernando Delgado3, Philip Willke2, and Sebastian Loth1 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Karlsruhe Institute of Technology, Physikalisches Institut, Karlsruhe, Germany — 3Instituto de estudios avanzados IUDEA, Departamento de Física, Universidad de La Laguna, Spainh
The orbital and spin properties of quantum systems at the nanoscale are heavily influenced by their interaction with the surrounding environment. For atoms adsorbed on a surface, this interaction commonly leads to a partial suppression of the orbital moment, a phenomenon known as orbital quenching. In this study, we investigate and modify the orbital quenching of titanium atoms (Ti) on two monolayers of MgO/Ag(100), the experimental "fruit fly" system for electron spin resonance measurements in conjunction with scanning tunneling microscope (STM). Our study demonstrates how we can finely adjust the spin and orbital excitations by the proximity of the STM tip, ranging from a nearly unquenched orbital moment to a highly quenched state. In addition, we use multiplet and transport calculations to gain a deeper understanding of the intricate interplay between atom ad-sorption on a surface and the quenching of their orbital moments.
Keywords: scanning tunneling microscopy; spins on surfaces; inelastic tunneling spectroscopy; orbital quenching; multiplet calculations