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O: Fachverband Oberflächenphysik
O 17: Spins on surfaces at the atomic scale – Poster
O 17.9: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Spin-Electric Control of Individual Spins on Surfaces — Paul Greule1, Wantong Huang1, Máté Stark1, Kwan Ho Au-Yeung1, Johannes Schwenk1, Jose Reina-Gálvez2, Christoph Sürgers1, Wolfgang Wernsdorfer1, Christoph Wolf3, and •Philip Willke1 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Department of Physics, University of Konstanz, Konstanz, Germany — 3Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea.
Individual magnetic molecules are promising building blocks for quantum technologies because of their chemical tunability, nanoscale dimensions, and ability to self-assemble into ordered arrays. In this work, we present spin-electric coupling (SEC) for two molecular spin systems, iron phthalocyanine (FePc) and Fe-FePc complexes, adsorbed on a surface. We use electron spin resonance combined with scanning tunnelling microscopy (ESR-STM) to locally address them with the STM tip and electrically tune them using the applied bias voltage. These measurements reveal a pronounced nonlinear voltage dependence of the resonance frequency, linked to the energic onset of other molecular orbitals. We attribute this effect to a transportmediated exchange field from the magnetic tip, providing a large, highly localized, and broadly applicable SEC mechanism. Finally, we demonstrate that the SEC enables all-electrical coherent spin control: In Rabi oscillation measurements of both single and coupled Fe-FePc complexes we show that the spin dynamics can be tuned.
Keywords: Spin–electric coupling (SEC); electron spin resonance; scanning tunneling microscopy; FePc molecular spin systems; Coherent all-electrical spin control