Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 1

O 47.4: Vortrag

Mittwoch, 7. September 2022, 16:00–16:15, S051

Anisotropic hyperfine interaction of surface-adsorbed single atoms — •Jinkyung Kim^{1, 2}, Kyungju Noh^{1, 2}, Yi Chen^{1, 3}, Christoph Wolf^{1, 3}, Andreas Heinrich^{1, 2}, and Yujeong Bae^{1, 2} — ¹Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Seoul 03760, South Korea — ²Department of Physics, Ewha Womans University, Seoul 03760, South Korea — ³Ewha Womans University, Seoul 03760, Republic of Korea

Hyperfine interactions between electron and nuclear spins provide sensitive probes to the chemical environment of atoms, molecules, and crystal defects as well as an alternative way to control the nuclear spins. While a variety of experimental techniques have been applied to the detection and control of single nuclear spins in various environments, simultaneous investigations of the single nuclear spin*s resonance and the atomic scale imaging are more demanding. Using the electron spin resonance (ESR) technique in a scanning tunneling microscope (STM), we investigated hyperfine interaction of hydrogenated titanium (Ti) on MgO/Ag(100) and its local environment at the atomic scale. By means of atom manipulation in vector magnetic fields, we identified the hyperfine interaction of Ti along three principal axes, which shows a large anisotropy of hyperfine interaction. As a sensitive probe of chemical environment, the observed hyperfine interaction reflects the anisotropic orbital configuration of the electronic ground state, which is further supported by the density functional theory calculations.