2025/11/28 by Juan A. Delgado‐Notario, Delgado-Notario, Juan A., C. Bray +35 · 1 voice
Engineering · Materials Science · Physics and Astronomy · #Graphene research and applications #Plasmonic and Surface Plasmon Research #Topological Materials and Phenomena
paper · doi:10.1002/nap2.70094
openalex created_date 2025/12/03 · openalex publication_date 2026/04/01 · openalex updated_date 2026/08/01
ABSTRACT Graphene plasmons confine incident terahertz fields far below the diffraction limit and, when hosted by a gate‐defined Fabry–Perot cavity, they enable electrically tunable, frequency‐selective photodetectors. In a magnetic field, these plasmons hybridize with the cyclotron motion to form magnetoplasmons, offering a platform for fundamental studies and for nonreciprocal, spectrally selective, and ultrasensitive terahertz photonics. However, implementing magnetoplasmon‐assisted resonant transistors at terahertz frequencies has remained challenging so far. Here, we extend the resonant Dyakonov–Shur graphene TeraFET framework into the magnetoplasmonic regime and use gate‐dependent, on‐chip terahertz photocurrent spectroscopy combined with a perpendicular magnetic field to resolve and probe the evolution of resonant magnetoplasmons in antenna‐coupled monolayer and bilayer graphene TeraFETs. In monolayer graphene, the dispersion reflects the Dirac nature of the carriers, exhibiting a nonmonotonic density dependence due to the interplay of plasma resonance and cyclotron motion, with an inflection point at maximal plasmon–cyclotron coupling. In contrast, in bilayer graphene, we recover and map a magnetoplasmon dispersion consistent with the conventional Schrödinger‐type picture. These results establish graphene TeraFET devices as a robust on‐chip platform for resonant magnetoplasmonics at terahertz frequencies, opening avenues toward magnetically programmable, frequency‐selective terahertz photodetectors.