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<p>Molecular spin systems are promising building blocks for quantum sensing and information processing because their properties can be chemically tuned. Yet compact mechanical platforms for driving molecular spins at room temperature and without applied magnetic fields remain underexplored. Here we show spin-acoustic resonance in pentacene thin films integrated with a high-quality-factor surface acoustic wave resonator on lithium niobate. In this heterogeneously integrated platform, the resonant drive is delivered mechanically by the acoustic wave. Using the photo-excited triplet state of pentacene at room temperature, we achieve coherent spin manipulation under zero externally applied magnetic field. The high-quality-factor multimode response enables spectrally selective addressing of triplet transitions near 105 megahertz. Coherent control is evidenced by Rabi oscillations whose frequency increases linearly with the square root of the applied radio-frequency generator power. These results establish acoustic-wave-mediated spin control in molecular thin films and benchmark mechanically delivered spin manipulation at room temperature.</p>

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Heterogeneous optically-detected spin-acoustic resonance in solid-state molecular thin-film

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月14日

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  • Kuan-Cheng Chen,
  • Yongqiang Wen,
  • Xiaotian Xu,
  • Max Attwood,
  • Jingdong Xu,
  • Chen Fu,
  • Sami Ramadan,
  • Shang Yu,
  • Sandrine Heutz,
  • Mark Oxborrow

摘要

Molecular spin systems are promising building blocks for quantum sensing and information processing because their properties can be chemically tuned. Yet compact mechanical platforms for driving molecular spins at room temperature and without applied magnetic fields remain underexplored. Here we show spin-acoustic resonance in pentacene thin films integrated with a high-quality-factor surface acoustic wave resonator on lithium niobate. In this heterogeneously integrated platform, the resonant drive is delivered mechanically by the acoustic wave. Using the photo-excited triplet state of pentacene at room temperature, we achieve coherent spin manipulation under zero externally applied magnetic field. The high-quality-factor multimode response enables spectrally selective addressing of triplet transitions near 105 megahertz. Coherent control is evidenced by Rabi oscillations whose frequency increases linearly with the square root of the applied radio-frequency generator power. These results establish acoustic-wave-mediated spin control in molecular thin films and benchmark mechanically delivered spin manipulation at room temperature.