We demonstrate that within the model of massless Dirac fermions, graphene has a strong nonlinear optical response in the terahertz regime. It is found that the nonlinear contribution significantly alters both the single frequency and frequency tripled optical response at experimentally relevant field strengths. The optical activity of single layer graphene is significantly enhanced by nonlinear effects, and the frequency tripled response opens the gateway to photonic and optoelectronic device applications.
Schwefelgefüllte Kügelchen: Ein neuartiger Kohlenstoff‐Schwefel‐Nanokomposit enthält Schwefel innerhalb von doppelschaligen, „weichen“ Kohlenstoff‐Hohlkugeln (siehe Bild) mit großer Oberfläche und Porosität. Dieses Material zeigt eine herausragende elektrochemische Leistungsfähigkeit als Kathodenmaterial für Lithium‐Schwefel‐Batterien.
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