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A simple and robust technique to extract the complex optical conductivity of truly two-dimensional materials is developed. Applying the method to chemical-vapor-deposited graphene, we extract the complex conductivity, including Fermi level and scattering time.
We evolved violet structural color from brown-colored butterflies over six generations of artificial selection. The mechanism of color generation was identified and found to mimic the natural evolution of violet/blue color in closely related species.
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