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We investigate the mechanical properties of proposed graphene-like hexagonal gallium nitride monolayer (g-GaN) using first-principles calculations based on density-functional theory. Compared to the graphene-like hexagonal boron nitride monolayer (g-BN), g-GaN is softer, with 40 % in-plane stiffness, 50 %, 46 %, and 42 % ultimate strengths in armchair, zigzag, and biaxial strains, respectively. However,...
The nonlinear optical properties, including two-, three-photon and excited-state absorption phenomena, were observed in three oligomerfluorene derivatives (abbreviated as OF3, OF5 and OF7) by femtosecond (450 fs) laser pulses. Their two-, three-photon and, excited-state absorption properties were studied by open Z-scan and pump-probe measurements. Interestingly, when the numbers of fluorene units...
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