Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 6: Molecular Magnetism
MA 6.2: Talk
Monday, March 18, 2024, 10:00–10:15, EB 301
Study of Landau-Zener transition of electron spin state on Single Ho atom — •Wonjun Jang1,2, Luciano Colazzo1,2, Georg A. Traeger4, Lei Fang1,2, Fabio Donati1,3, Chau Bui1,3, Soo-Hyon Phark1,3, and Andreas Heinrich1,3 — 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, South Korea — 2Ewha Womans University, Seoul 03760, South Korea. — 3Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea — 4Physik, Georg-August-Universität, Göttingen, Germany
We report Landua-zener transition of electron spin states of a single Holmium (Ho) atom using spin-polarized scanning tunneling microscopy (STM). Single Ho atom on an oxygen site on MgO results in avoided level crossings due to the crystal field and hyperfine interaction. These avoided level crossings manifest as nuclear spin-mediated Landau-Zener tunneling of the electron spin state. By employing a combination of magnetic field sweeping and spin-polarized scanning tunneling microscopy, we measured the probabilities of electron spin reversal through Landau-Zener tunneling at the avoided level crossing with an energy gap of 5 peV. The maximum probability observed is 16%, influenced by the thermal population of nuclear spin states. Our spin-polarized STM measurement at the specific avoided level crossing enabled the single-shot measurement of the nuclear spin state. This research represents a direct measurement of the time evolution of the nuclear spin state of a rare earth atom.
Keywords: Landau-Zener transition; STM; Rare earth atom; spin polarized stm