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• W3102103692 abstract "Graphene, a unique two-dimensional material comprising carbon in a honeycomb lattice 1 , has brought breakthroughs across electronics, mechanics and thermal transport, driven by the quasiparticle Dirac fermions obeying a linear dispersion 2,3 . Here, we demonstrate a counter-pumped all-optical difference frequency process to coherently generate and control terahertz plasmons in atomic-layer graphene with octave-level tunability and high efficiency. We leverage the inherent surface asymmetry of graphene for strong second-order nonlinear polarizability 4,5 , which, together with tight plasmon field confinement, enables a robust difference frequency signal at terahertz frequencies. The counter-pumped resonant process on graphene uniquely achieves both energy and momentum conservation. Consequently, we demonstrate a dual-layer graphene heterostructure with terahertz charge- and gate-tunability over an octave, from 4.7 THz to 9.4 THz, bounded only by the pump amplifier optical bandwidth. Theoretical modelling supports our single-volt-level gate tuning and optical-bandwidth-bounded 4.7 THz phase-matching measurements through the random phase approximation, with phonon coupling, saturable absorption and below the Landau damping, to predict and understand graphene plasmon physics. An all-optical difference frequency process is exploited to generate terahertz graphene plasmons that are tunable over an octave." @default.
• W3102103692 created "2020-11-23" @default.
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• W3102103692 date "2017-12-11" @default.
• W3102103692 modified "2023-10-16" @default.
• W3102103692 title "Broadband gate-tunable terahertz plasmons in graphene heterostructures" @default.
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• W3102103692 doi "https://doi.org/10.1038/s41566-017-0054-7" @default.
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