In a 3D woodpile photonic crystal, joining shifted unit cells creates interface and hinge states, and a Wilson loop based partial Chern number calculation gives a sign-flip rule for hinge state emergence.
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Wilson Loop and Topological Properties in 3D Woodpile Photonic Crystal
In a 3D woodpile photonic crystal, joining shifted unit cells creates interface and hinge states, and a Wilson loop based partial Chern number calculation gives a sign-flip rule for hinge state emergence.