Cheng Guanghui, Lin Meng-Hsien, Chen Hung-Ying, Wang Dongli, Wang Zheyan, Qin Wei, Zhang Zhenyu, Zeng Changgan
CAS Key Laboratory of Strongly Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, China.
Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, Japan.
Nat Commun. 2024 Jul 18;15(1):6037. doi: 10.1038/s41467-024-50452-4.
In recent years, lightwave has stood out as an ultrafast, non-contact control knob for developing compact superconducting circuitry. However, the modulation efficiency is limited by the low photoresponse of superconductors. Plasmons, with the advantages of strong light-matter interaction, present a promising route to overcome the limitations. Here we achieve effective modulation of superconductivity in thin-film NbSe via near-field coupling to plasmons in gold nanoparticles. Upon resonant plasmon excitation, the superconductivity of NbSe is substantially suppressed. The modulation factor exceeds 40% at a photon flux of 9.36 × 10smm, and the effect is significantly diminished for thicker NbSe samples. Our observations can be theoretically interpreted by invoking the non-equilibrium electron distribution in NbSe driven by the plasmon-associated evanescent field. Finally, a reversible plasmon-driven superconducting switch is realized in this system. These findings highlight plasmonic tailoring of quantum states as an innovative strategy for superconducting electronics.
近年来，光波作为一种用于开发紧凑型超导电路的超快、非接触式控制旋钮脱颖而出。然而，调制效率受到超导体低光响应的限制。等离子体激元具有强光与物质相互作用的优点，为克服这些限制提供了一条有前景的途径。在此，我们通过与金纳米颗粒中的等离子体激元进行近场耦合，实现了对薄膜NbSe超导性的有效调制。在共振等离子体激元激发时，NbSe的超导性被显著抑制。在光子通量为9.36×10smm时，调制因子超过40%，而对于更厚的NbSe样品，这种效应明显减弱。我们的观察结果可以通过调用由等离子体激元相关倏逝场驱动的NbSe中的非平衡电子分布从理论上进行解释。最后，在该系统中实现了一个可逆的等离子体激元驱动超导开关。这些发现突出了等离子体激元对量子态的调控作为超导电子学的一种创新策略。
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