(a), (b) Intensity distributions of the nonlinear beam (top panels, blue line) at propagation distances (a) z = 11 mm (left column) and (b) z = 22 mm (right column). The input beam has a Gaussian envelope along the domain wall with maximum intensity I 0 = 2.5 × 10 15 W/ m 2. Nonlinear dynamics of the optical beam at the valley-Hall domain wall at a zigzag interface in a honeycomb lattice of laser-written waveguides.
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