Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies IV
O 43.9: Talk
Wednesday, March 20, 2024, 12:30–12:45, MA 004
Electrically Driven Spin Resonance of 4f Electrons in a Single Atom on a Surface — •Stefano Reale1,2,3, Jiyoon Hwang1,4, Jeongmin Oh1,4, Harald Brune5, Andreas J. Heinrich1,4, Fabio Donati1,4, and Yujeong Bae1,4 — 1Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Seoul 03760, Republic of Korea — 2Ewha Womans University, Seoul 03760, Republic of Korea — 3Department of Energy, Politecnico di Milano, Milano 20133, Italy — 4Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea — 5Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Lanthanide atoms on surfaces are an exceptional platform for atomic-scale magnetic information storage. However, their potential as qubits is yet unexplored due to the limited number of experimental set-ups that can coherently drive the spins of single adatoms. Through x-ray magnetic circular dichroism and multiplet calculations, we identified erbium (Er) atoms on MgO(100)/Ag(100) as promising candidates for quantum coherent operations. This is due to their magnetic ground state and the inherent decoupling from the environment typical of the 4f shell. Here we employed scanning tunneling microscope to drive electron spin resonance (ESR) in a single Er atom. We exploited the well characterized titanium (Ti) atom to engineer a suitable Ti-Er dimer through atomic manipulation. This architecture allows us, through magnetic coupling, to access the spin state of Er, driving and detecting ESR transitions on its elusive 4f spins.
Keywords: Lanthanide atoms; Electron spin resonance; Scanning tunneling microscopy; Quantum sensing