The tight-binding model of the HOTI and the corresponding topological circuit (IMAGE)
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On the left, the tight model of the HOTI is fabricated with 2.5×2.5×2.5 unit cells. The chessboard π-flux configuration projectively changes the conventional reflection into the k-NS one. On the right is the topological circuit used to experimentally verify the topological properties of the HOTI.
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