Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Spins on surfaces at the atomic scale I
O 15.6: Vortrag
Montag, 9. März 2026, 16:30–16:45, WILL/A317
Two-photon transition in an Er-Ti atomic spin pair — •Dasom Choi1,2, Yaowu Liu1,2, Stefano Reale2,3, Jeongmin Oh1,2, Lei Fang1,2, We-hyo Seo1,2, Andreas Heinrich1,2, Fabio Donati1,2, and Soo-hyon Phark1,2 — 1Department of Physics, Ewha Womans University, Seoul, Republic of Korea — 2Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Seoul, Republic of Korea — 3QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands
Multi-photon process becomes a key ingredient in quantum information science, offering a promising route to nonlinear quantum transitions and entanglement generation. Extending this to atomic spin qubits on surfaces is of great interest, yet has not been demonstrated. In this work, we investigate a spin-pair of Er and Ti atoms adsorbed on a MgO/Ag(100) surface using a scanning tunneling microscope (STM). By applying pulsed electron spin resonance in the STM, we realize two-photon resonant transitions corresponding to an angular momentum change of Δ m = ± 2 of the spin-pair, a phenomenon beyond the conventional single-photon processes as shown at the single atom level. Our work demonstrates the ability to coherently control higher-order quantum transitions at the single spin level, which provides a novel pathway towards implementing multi-quantum gate operations in atomic spin qubits, highlighting the potential of single atomic lanthanides on a surface for quantum information processing.
Keywords: ESR-STM; Erbium; Two-photon; Coherent control; 4f electron spin