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O: Fachverband Oberflächenphysik
O 15: Spins on Surfaces at the Atomic Scale II
O 15.12: Talk
Monday, March 27, 2023, 17:45–18:00, REC C 213
Lanthanide atoms on MgO(100)/Ag(100) as Candidate for Single-Atom-Qubits — Stefano Reale1,2,3, Aparajita Singha1,2,4, Safa L. Ahmed1,2, Denis Krylov1,2, Luciano Colazzo1,2, Christoph Wolf1,2, Carlo S. Casari3, Alessandro Barla5, Edgar Fernandez6, Francois Patthery6, Marina Pivetta6, Stefano Rusponi6, Harald Brune6, and •Fabio Donati1,2 — 1Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Republic of Korea — 2Department of Physics, Ewha Womans University, Republic of Korea — 3Department of Energy, Politecnico di Milano, Italy — 4Max Planck Institute for Solid State Research, Germany — 5Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), Italy — 6Institute of Physics, Ecole Polytechnique Federale de Lausanne, Switzerland
Lanthanide atoms on surfaces are an exceptional platform for atomic-scale magnetic information storage [Science 352, 318 (2016)]. However, their potential as qubits is yet unexplored. Here we combine x-ray absorption spectroscopy and scanning tunneling microscopy (STM) with density functional theory and multiplet calculations to estimate the performance of Er and Tm on MgO(100)/Ag(100) as spin qubit candidates. For both atoms, we infer a magnetic ground state that is suitable for quantum coherent operations. By adapting the piezoelectric model of electron spin resonance (ESR)-STM [Science Advances 6, eabc5511 (2020)] to the case of lanthanide atoms, we predict a detectable signal and a higher Rabi rate compared to the systems studied up to date [S. Reale et al., accepted in Phys. Rev. B].