Spin-Electric Control of Individual Molecules on Surfaces

Paul Greule; Wantong Huang; Máté Stark; Kwan Ho Au-Yeung; Johannes Schwenk; Jose Reina-Gálvez; Christoph Sürgers; Wolfgang Wernsdorfer; Christoph Wolf; Philip Willke

arXiv · 2507.13699

Spin-Electric Control of Individual Molecules on Surfaces

Paul Greule·Wantong Huang·Máté Stark·Kwan Ho Au-Yeung·Johannes Schwenk·Jose Reina-Gálvez·Christoph Sürgers·Wolfgang Wernsdorfer·Christoph Wolf·Philip Willke

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Abstract

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. However, harnessing their properties in quantum information processing requires precise local control of their spin properties. 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 transport-mediated 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, demonstrating a pathway towards electrically controlled quantum operation.

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Paul Greule, Wantong Huang, Máté Stark, Kwan Ho Au-Yeung, Johannes Schwenk, Jose Reina-Gálvez, Christoph Sürgers, Wolfgang Wernsdorfer, Christoph Wolf, Philip Willke. 2025-07-18. Spin-Electric Control of Individual Molecules on Surfaces. https://arxiv.org/abs/2507.13699

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