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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2510.27494 |
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| _version_ | 1866914126993817600 |
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| author | Pinilla-Cienfuegos, Elena Mascaró-Burguera, Lucas Torres-Cavanillas, Ramón Echavarría, J. Ignacio Regueiro, Alejandro Coronado, Eugenio Hernandez-Rueda, Javier |
| author_facet | Pinilla-Cienfuegos, Elena Mascaró-Burguera, Lucas Torres-Cavanillas, Ramón Echavarría, J. Ignacio Regueiro, Alejandro Coronado, Eugenio Hernandez-Rueda, Javier |
| contents | The ability to control and understand the phase transitions of individual nanoscale building blocks is key to advancing the next generation of low-power reconfigurable nanophotonic devices. To address this critical challenge, molecular nanoparticles (NPs) exhibiting a spin crossover (SCO) phenomenon are trapped by coupling a quadrupole Paul trap with a multi-spectral polarization-resolved scattering microscope. This contact-free platform simultaneously confines, optically excites, and monitors the spin transition in Fe(II)-triazole NPs in a pressure-tunable environment, eliminating substrate artifacts. Thus, we show light-driven manipulation of the spin transition in levitating NPs free from substrate-induced effects. Using the robust spin bistability near room temperature of our SCO system, we quantify reversible opto-volumetric changes of up to 6%, revealing precise switching thresholds at the single-particle level. Independent pressure modulation produces a comparable size increase, confirming mechanical control over the same bistable transition. These results constitute full real-time control and readout of spin states in levitating SCO NPs, charting a route toward their integration into ultralow-power optical switches, data-storage elements, and nanoscale sensors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_27494 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unveiling Spin Transition at Single Particle Level in Levitating Spin Crossover Nanoparticles Pinilla-Cienfuegos, Elena Mascaró-Burguera, Lucas Torres-Cavanillas, Ramón Echavarría, J. Ignacio Regueiro, Alejandro Coronado, Eugenio Hernandez-Rueda, Javier Optics Materials Science The ability to control and understand the phase transitions of individual nanoscale building blocks is key to advancing the next generation of low-power reconfigurable nanophotonic devices. To address this critical challenge, molecular nanoparticles (NPs) exhibiting a spin crossover (SCO) phenomenon are trapped by coupling a quadrupole Paul trap with a multi-spectral polarization-resolved scattering microscope. This contact-free platform simultaneously confines, optically excites, and monitors the spin transition in Fe(II)-triazole NPs in a pressure-tunable environment, eliminating substrate artifacts. Thus, we show light-driven manipulation of the spin transition in levitating NPs free from substrate-induced effects. Using the robust spin bistability near room temperature of our SCO system, we quantify reversible opto-volumetric changes of up to 6%, revealing precise switching thresholds at the single-particle level. Independent pressure modulation produces a comparable size increase, confirming mechanical control over the same bistable transition. These results constitute full real-time control and readout of spin states in levitating SCO NPs, charting a route toward their integration into ultralow-power optical switches, data-storage elements, and nanoscale sensors. |
| title | Unveiling Spin Transition at Single Particle Level in Levitating Spin Crossover Nanoparticles |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2510.27494 |