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. 2016 May 5;6:25442. doi: 10.1038/srep25442

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Full wave numerical (Comsol Multi-physics) calculations (Real part of the transverse magnetic field component, H_y) demonstrating negative refraction of a monochromatic (ω = 810 cm⁻¹) TM-polarized Gaussian beam incident from air with incidence angle 30° to (a) hBN, and to GhHC for (b) μ_c = 0.35 eV (c) μ_c = 0.45 eV.