Spin-Electric Control of Individual Molecules on Surfaces
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915398007390208 |
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| author | Greule, Paul Huang, Wantong Stark, Máté Au-Yeung, Kwan Ho Schwenk, Johannes Reina-Gálvez, Jose Sürgers, Christoph Wernsdorfer, Wolfgang Wolf, Christoph Willke, Philip |
| author_facet | Greule, Paul Huang, Wantong Stark, Máté Au-Yeung, Kwan Ho Schwenk, Johannes Reina-Gálvez, Jose Sürgers, Christoph Wernsdorfer, Wolfgang Wolf, Christoph Willke, Philip |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_13699 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin-Electric Control of Individual Molecules on Surfaces Greule, Paul Huang, Wantong Stark, Máté Au-Yeung, Kwan Ho Schwenk, Johannes Reina-Gálvez, Jose Sürgers, Christoph Wernsdorfer, Wolfgang Wolf, Christoph Willke, Philip Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | Spin-Electric Control of Individual Molecules on Surfaces |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2507.13699 |