Simulated HHG in three tight-binding models shows observable differences between topological phases, but controlled comparisons are missing and the HOTI claim is a null result.
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High Harmonic Spectroscopy from Lower-Order to Higher-Order Topological Insulators
Simulated HHG in three tight-binding models shows observable differences between topological phases, but controlled comparisons are missing and the HOTI claim is a null result.