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Strong transient magnetic fields induced by THz-driven plasmons in graphene disks. | LitMetric

AI Article Synopsis

  • Strong circularly polarized light can create and control magnetic fields in solid-state systems through phenomena like the optical inverse Faraday effect and phonon inverse Faraday effect.
  • Plasmonic resonances in materials like graphene offer a way to fine-tune these light-induced magnetic fields by adjusting their dimensions and carrier concentrations.
  • The research shows that graphene disks can produce a transient magnetic field with high efficiency, achieving a significant ultrafast Faraday rotation and an estimated magnetic field strength of about 0.7 T with moderate light input.

Article Abstract

Strong circularly polarized excitation opens up the possibility to generate and control effective magnetic fields in solid state systems, e.g., via the optical inverse Faraday effect or the phonon inverse Faraday effect. While these effects rely on material properties that can be tailored only to a limited degree, plasmonic resonances can be fully controlled by choosing proper dimensions and carrier concentrations. Plasmon resonances provide new degrees of freedom that can be used to tune or enhance the light-induced magnetic field in engineered metamaterials. Here we employ graphene disks to demonstrate light-induced transient magnetic fields from a plasmonic circular current with extremely high efficiency. The effective magnetic field at the plasmon resonance frequency of the graphene disks (3.5 THz) is evidenced by a strong ( ~ 1°) ultrafast Faraday rotation ( ~ 20 ps). In accordance with reference measurements and simulations, we estimated the strength of the induced magnetic field to be on the order of 0.7 T under a moderate pump fluence of about 440 nJ cm.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10657377PMC
http://dx.doi.org/10.1038/s41467-023-43412-xDOI Listing

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