Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Spins on surfaces at the atomic scale I
O 15.9: Vortrag
Montag, 9. März 2026, 17:15–17:30, WILL/A317
Coherent control of a single 4f electron spin — •Yaowu Liu1,2, Dasom Choi1,2,3, Stefano Reale1,2, Jeongmin Oh1,2,3, Lei Fang1,2, We-hyon Soe1,2, Andreas Heinrich1,2,3, Soo-hyon Phark1,2, and Fabio Donati1,2,3 — 1IBS Center for Quantum Nanoscience (QNS) — 2Ewha Womans University, Seoul 03760, Korea — 3Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
Electron spins on surface provide an atomic scale qubit platform for quantum information science using scanning tunneling microscopy (STM). Lanthanide atoms, with their strongly localized 4f electrons, can be potential candidates for single atom qubits with a long quantum coherence. However, STM tunneling current can strongly reduce the coherence time of surface atoms if they are probed directly. To circumvent this issue, it is possible to use an alternative scheme where a Ti (S = 1/2) atom located in a position within a 1 nm distance from a single Er atom on MgO surface can sense the quantum spin states of its 4f electron shells. In this work, we performed pulsed electron spin resonance (ESR) on the Er atom and demonstrated coherent control of 4f-electron spin of a single Er atom. Moreover, we observed a tenfold enhancement of Rabi rate compared to the direct drive of Ti atom from the tip, which is ascribed to the anisotropy of exchange interaction between the two spins.
Keywords: 4f electron spin; Erbium; ESR-STM; Coherent control; Driving mechanism